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Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Jan. 31, 2019	Mar. 28, 2019	Jul. 31, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	REX AMERICAN RESOURCES Corp
Document Type	10-K
Current Fiscal Year End Date	--01-31
Entity Common Stock, Shares Outstanding		6,274,419
Entity Public Float			$ 435,431,150
Amendment Flag	false
Entity Central Index Key	0000744187
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Jan. 31, 2019
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Ex Transition Period	false

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 188,531	$ 190,988
Restricted cash	281	354
Short-term investments	14,975
Accounts receivable	11,378	12,913
Inventory	18,477	20,755
Refundable income taxes	7,695	6,612
Prepaid expenses and other	9,284	7,412
Total current assets	250,621	239,034
Property and equipment - net	182,521	197,827
Other assets	6,176	7,454
Equity method investments	32,075	34,549
TOTAL ASSETS	471,393	478,864
CURRENT LIABILITIES:
Accounts payable – trade	7,463	8,149
Accrued expenses and other current liabilities	9,546	13,716
Total current liabilities	17,009	21,865
LONG TERM LIABILITIES:
Deferred taxes	4,185	21,706
Other long term liabilities	4,928	3,367
Total long term liabilities	9,113	25,073
EQUITY:
Common stock, 45,000 shares authorized, 29,853 shares issued at par	299	299
Paid in capital	148,273	146,923
Retained earnings	579,558	547,913
Treasury stock, 23,580 and 23,287 shares, respectively	(335,193)	(313,643)
Total REX shareholders’ equity	392,937	381,492
Noncontrolling interests	52,334	50,434
Total equity	445,271	431,926
TOTAL LIABILITIES AND EQUITY	$ 471,393	$ 478,864

CONSOLIDATED BALANCE SHEETS (Parentheticals) - shares shares in Thousands	Jan. 31, 2019	Jan. 31, 2018
Common stock, shares authorized	45,000	45,000
Common stock, shares issued	29,853	29,853
Treasury stock, shares	23,580	23,287

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Net sales and revenue	$ 486,671	$ 452,586	$ 453,799
Cost of sales	456,456	408,425	382,760
Gross profit	30,215	44,161	71,039
Selling, general and administrative expenses	(20,551)	(24,060)	(21,388)
Equity in income of unconsolidated affiliates	1,536	3,232	6,144
Interest and other income, (net)	3,388	2,060	1,116
Income before income taxes	14,588	25,393	56,911
Benefit (provision) for income taxes	22,922	19,519	(17,393)
Net income	37,510	44,912	39,518
Net income attributable to noncontrolling interests	(5,865)	(5,206)	(7,185)
Net income attributable to REX common shareholders	$ 31,645	$ 39,706	$ 32,333
Weighted average shares outstanding – basic and diluted (in Shares)	6,440	6,596	6,587
Basic and diluted net income per share attributable to REX common shareholders (in Dollars per share)	$ 4.91	$ 6.02	$ 4.91

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Balance at Jan. 31, 2016	$ 299	$ (309,754)	$ 144,844	$ 475,874	$ 44,496	$ 355,759
Balance (in Shares) at Jan. 31, 2016	29,853,000	23,204,000
Net income				32,333	7,185	39,518
Treasury stock acquired		$ (4,353)				$ (4,353)
Treasury stock acquired (in Shares)		88,000				87,904
Noncontrolling interests distribution and other					(3,842)	$ (3,842)
Stock options and related tax effects		$ 269	923			1,192
Balance at Jan. 31, 2017	$ 299	$ (313,838)	145,767	508,207	47,839	388,274
Balance (in Shares) at Jan. 31, 2017	29,853,000	23,292,000
Net income				39,706	5,206	44,912
Capital contributions					918	918
Noncontrolling interests distribution and other					(3,529)	(3,529)
Stock options and related tax effects		$ 195	1,156			1,351
Stock options and related tax effects (in Shares)		(5,000)
Balance at Jan. 31, 2018	$ 299	$ (313,643)	146,923	547,913	50,434	431,926
Balance (in Shares) at Jan. 31, 2018	29,853,000	23,287,000
Net income				31,645	5,865	37,510
Capital contributions					524	524
Treasury stock acquired		$ (21,855)				$ (21,855)
Treasury stock acquired (in Shares)		305,000				305,473
Noncontrolling interests distribution and other					(4,489)	$ (4,489)
Stock options and related tax effects		$ 305	1,350			1,655
Stock options and related tax effects (in Shares)		(12,000)
Balance at Jan. 31, 2019	$ 299	$ (335,193)	$ 148,273	$ 579,558	$ 52,334	$ 445,271
Balance (in Shares) at Jan. 31, 2019	29,853,000	23,580,000

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 37,510	$ 44,912	$ 39,518
Depreciation	24,828	21,462	19,519
Stock based compensation expense	669	1,641	1,314
Income from equity method investments	(1,536)	(3,232)	(6,144)
Dividends received from equity method investments	4,010	6,516	7,018
Interest income from investments	(1,077)
Loss (gain) on sale of investment		13	(192)
Loss (gain) on disposal of real estate and property and equipment	104	192	(328)
Deferred income tax	(23,364)	(18,605)	3,043
Changes in assets and liabilities:
Accounts receivable	1,535	(1,089)	(2,535)
Inventory	2,278	(3,649)	121
Prepaid expenses and other assets	5,217	(1,170)	(1,357)
Income taxes refundable	(1,083)	(5,542)	4,184
Accounts payable-trade	339	(1,705)	36
Accrued expenses and other liabilities	(1,499)	1,225	4,912
Net cash provided by operating activities	47,931	40,969	69,109
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(10,775)	(24,017)	(14,208)
Purchase of short-term investment	(125,989)
Sale of short-term investments	112,091
Acquisition of business, net of cash acquired		(12,049)
Proceeds from sale of investment		64	4,492
Proceeds from sale of real estate and property and equipment		104	1,511
Repayment of note receivable	27	26	24
Restricted investments and deposits	5	150	510
Net cash used in investing activities	(24,641)	(35,722)	(7,671)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments to noncontrolling interests holders	(4,489)	(3,529)	(3,842)
Capital contributions from minority investor	524	918
Treasury stock acquired	(21,855)		(4,709)
Net cash used in financing activities	(25,820)	(2,611)	(8,551)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(2,530)	2,636	52,887
CASH, CASH EQUIVALENTS AND RESTRICTED CASH-Beginning of year	191,342	188,706	135,819
CASH, CASH EQUIVALENTS AND RESTRICTED CASH-End of year	188,812	191,342	188,706
Non cash financing activities-Equity awards issued	1,473	1,195	1,095
Non cash financing activities-Equity awards accrued	487	1,485	1,217
Non cash investing activities-Accrued capital expenditures		1,149	342
Cash and cash equivalents	188,531	190,988	188,576
Restricted cash	281	354	130
Cash, cash equivalents and restricted cash, end of period	$ 188,812	$ 191,342	$ 188,706

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Jan. 31, 2019

Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

1.	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation – The accompanying financial statements consolidate the operating results and financial position of REX American Resources Corporation and its wholly-owned and majority owned subsidiaries (the “Company” or “REX”). All intercompany balances and transactions have been eliminated. As of January 31, 2019, the Company owns interests in five operating entities – four are consolidated and one is accounted for using the equity method of accounting. The results of One Earth are included on a delayed basis of one month lag as One Earth has a fiscal year end of December 31. The other consolidated entities have the same fiscal year end as the parent company.

Fiscal Year – All references in these consolidated financial statements to a particular fiscal year are to the Company’s fiscal year ended January 31. For example, “fiscal year 2018” means the period February 1, 2018 to January 31, 2019. The Company refers to its fiscal year by reference to the year immediately preceding the January 31 fiscal year end date.

Segments – In fiscal year 2017, the Company began reporting the results of its refined coal operation as a new segment as a result of the August 10, 2017 acquisition of an entity that operates a refined coal facility (see Note 4). Prior to the acquisition, the Company had one reportable segment, ethanol. Beginning with the third quarter of fiscal year 2017, the Company has two reportable segments: i) ethanol and by-products and ii) refined coal. Within the ethanol and by-products segment, the Company has equity investments in three ethanol limited liability companies, two of which are majority ownership interests. Within the refined coal segment, the Company has a majority equity interest in one refined coal limited liability company.

In applying the criteria set forth in ASC 280, the Company determined that based on the nature of the products and production process and the expected financial results, the Company’s operations at its ethanol plants are aggregated into one reporting segment.

Use of Estimates – The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Cash Equivalents – Cash equivalents are principally short-term investments with original maturities of less than three months. The carrying amount of cash equivalents approximates fair value.

Basis of Presentation –Interest and other income, net includes the following (amounts in thousands):

	Fiscal Year 2018			Fiscal Year 2017			Fiscal Year 2016

Interest income	$	3,514		$	1,556		$	434
(Loss) gain on sale of investment		—			(13	)		192
(Loss) gain on disposal of real estate and property and equipment, net		(104	)		(192	)		328
Other		(22	)		709			162
Total	$	3,388		$	2,060		$	1,116

Concentrations of Risk –The Company maintains cash and cash equivalents in accounts with financial institutions which exceed federally insured limits. The Company has not experienced any losses in such accounts. The Company does not believe there is significant credit risk related to its cash and cash equivalents. Six (fiscal years 2018 and 2017) and five (fiscal year 2016) customers accounted for approximately 85%, 87% and 83% of the Company’s net sales and revenue during fiscal years 2018, 2017 and 2016, respectively. At January 31, 2019 and 2018, these customers represented approximately 80% and 89%, respectively, of the Company’s accounts receivable balance.

Inventory – Inventories are carried at the lower of cost or market on a first-in, first-out basis. Inventory includes direct production costs and certain overhead costs such as depreciation, property taxes and utilities related to producing ethanol and related by-products and refined coal. Inventory is permanently written down for instances when cost exceeds estimated net realizable value; such write-downs are based primarily upon commodity prices as the market value of inventory is often dependent upon changes in commodity prices. There was no significant write-down of inventory during fiscal years 2018, 2017 or 2016. Fluctuations in the write-down of inventory generally relate to the levels and composition of such inventory at a given point in time and commodity prices. The components of inventory are as follows (amounts in thousands):

	January 31,
	2019		2018

Ethanol and other finished goods	$	5,767	$	8,402
Work in process		3,094		2,824
Grain and other raw materials		9,616		9,529

Total	$	18,477	$	20,755

Property and Equipment – Property and equipment is recorded at cost or the fair value on the date of acquisition (for property and equipment acquired in a business combination). Depreciation is computed using the straight-line method. Estimated useful lives are 5 to 40 years for buildings and improvements, and 2 to 20 years for fixtures and equipment. The components of property and equipment are as follows (amounts in thousands):

	January 31,
	2019			2018

Land and improvements	$	21,469		$	21,074
Buildings and improvements		23,608			23,272
Machinery, equipment and fixtures		297,807			288,832
Construction in progress		708			3,155

		343,592			336,333
Less: accumulated depreciation		(161,071	)		(138,506	)

Total	$	182,521		$	197,827

In accordance with ASC 360-05 “Impairment or Disposal of Long-Lived Assets”, the carrying value of long-lived assets is assessed for recoverability by management when changes in circumstances indicate that the carrying amount may not be recoverable.

The Company tests for recoverability of an asset group by comparing its carrying amount to its estimated undiscounted future cash flows. If the carrying amount exceeds its estimated undiscounted future cash flows, the Company recognizes an impairment charge for the amount by which the asset group’s carrying amount exceeds its fair value, if any. The Company recorded no impairment charges in fiscal years 2018, 2017 and 2016.

Depreciation expense was approximately $24,828,000, $21,462,000 and $19,519,000 in fiscal years 2018, 2017 and 2016, respectively.

Investments – The method of accounting applied to long-term investments, whether consolidated, equity or cost, involves an evaluation of the significant terms of each investment that explicitly grant or suggest evidence of control or influence over the operations of the investee and also includes the identification of any variable interests in which the Company is the primary beneficiary. The Company accounts for investments in limited liability companies in which it may have a less than 20% ownership interest, using the equity method of accounting when the factors discussed in ASC 323 are met. The excess of the carrying value over the underlying equity in the net assets of equity method investees is allocated to specific assets and liabilities. Investments in businesses that the Company does not control but for which it has the ability to exercise significant influence over operating and financial matters are accounted for using the equity method. The Company accounts for its investment in Big River using the equity method of accounting and includes the results of Big River on a delayed basis of one month as it has a fiscal year end of December 31.

The Company periodically evaluates its investments for impairment due to declines in market value considered to be other than temporary. Such impairment evaluations include, in addition to persistent, declining market prices, general economic and company-specific evaluations. If the Company determines that a decline in market value is other than temporary, then a charge to earnings is recorded in the Consolidated Statements of Operations and a new cost basis in the investment is established.

Short-term investments, consisting of U.S. government obligations, are considered held-to-maturity, and, therefore are carried at amortized historical cost.

Revenue Recognition – For ethanol and by-products segment sales, the Company recognizes sales of ethanol, distillers grains and non-food grade corn oil when obligations under the terms of the respective contracts with customers are satisfied; this occurs with the transfer of control of products, generally upon shipment from the ethanol plant or upon loading of the rail car used to transport the products. For refined coal segment sales, the Company recognizes sales of refined coal when obligations under the term of the contract with its customer are satisfied; this occurs when control of the product transfers to the customer, generally upon the coal leaving the refined coal plant. Refined coal sales are recorded net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold (after processing).

Cost of Sales – Cost of sales includes depreciation, costs of raw materials, inbound freight charges, purchasing and receiving costs, inspection costs, shipping costs, other distribution expenses, warehousing costs, plant management, certain compensation costs and general facility overhead charges.

Selling, General and Administrative Expenses – The Company includes non-production related costs such as professional fees, selling charges and certain payroll in selling, general and administrative expenses.

Financial Instruments – Certain of the forward grain purchase and ethanol, distillers grains and non-food grade corn oil sale contracts are accounted for under the “normal purchases and normal sales” scope exemption of ASC 815, because these arrangements are for purchases of grain that will be delivered in quantities expected to be used and sales of ethanol, distillers grains and non-food grade corn oil that will be produced in quantities expected to be sold by us over a reasonable period of time in the normal course of business. During the years ended January 31, 2019, 2018 and 2017 there were no material settlements of forward contracts that were recorded at fair value. At January 31, 2019, the company recorded a liability of $21,000 associated with contracts not accounted for under the “normal purchases and normal sales” scope exemption of ASC 815. At January 31, 2018, the Company recorded an asset of approximately $0.1 million associated with contracts not accounted for under the “normal purchases and normal sales” scope exemption of ASC 815.

The Company uses derivative financial instruments (exchange-traded futures contracts) to manage a portion of the risk associated with changes in commodity prices, primarily related to corn. The Company monitors and manages this exposure as part of its overall risk management policy. As such, the Company seeks to reduce the potentially adverse effects that the volatility of these markets may have on its operating results. The Company may take hedging positions in these commodities as one way to mitigate risk. While the Company attempts to link its hedging activities to purchase and sale activities, there are situations in which these hedging activities can themselves result in losses. The Company does not hold or issue derivative financial instruments for trading or speculative purposes. The changes in fair value of these derivative financial instruments are recognized in current period earnings as the Company does not use hedge accounting.

Stock Compensation – The Company has a stock-based compensation plan, approved by its shareholders, which reserves a total of 550,000 shares of common stock for issuance pursuant to its terms. The plan provides for the granting of shares of stock, including options to purchase shares of common stock, stock appreciation rights tied to the value of common stock, restricted stock, and restricted stock unit awards to eligible employees, non-employee directors and consultants. The Company measures share-based compensation grants at fair value on the grant date, adjusted for estimated forfeitures. The Company records noncash compensation expense related to equity and liability awards in its consolidated financial statements over the requisite service period on a straight-line basis. See Note 12 for a further discussion of restricted stock.

Income Taxes – The Company provides for deferred tax liabilities and assets for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. The Company provides for a valuation allowance if, based on the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. The Company’s annual effective tax rate includes the impact of its refined coal operation and the expected federal income tax credits to be earned and the impact of research and experimentation credits. In addition, for fiscal year 2017, the Company’s annual effective tax rate includes a benefit related to remeasuring deferred tax liabilities at a federal income tax rate of 21% compared to 35% in historical periods, a result of the Tax Act, which reduced the federal income tax rate on corporations from 35% to 21%.

Comprehensive Income – The Company has no components of other comprehensive income, and therefore, comprehensive income equals net income.

New Accounting Pronouncements – Effective February 1, 2018, the Company adopted the amended guidance in ASC Topic 606 “Revenue from Contracts with Customers”, which requires revenue recognition to reflect the transfer of promised goods or services to customers and replaces existing revenue recognition guidance. See Note 3 for a discussion of the adoption of this amended guidance.

Effective February 1, 2018, the Company prospectively adopted Accounting Standards Update “ASU” 2016-15 “Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments”. This standard provides guidance on eight specific cash flow issues. The cash flow issues covered by this ASU are: 1) debt prepayment or debt extinguishment costs; 2) settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; 3) contingent consideration payments made after a business combination; 4) proceeds from the settlement of insurance claims; 5) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; 6) distributions received from equity method investees; 7) beneficial interests in securitization transactions; and 8) separately identifiable cash flows and application of the predominance principle for distributions received from equity method investees in the Statement of Cash Flows. The adoption of this standard did not affect the consolidated financial statements and related disclosures.

Effective February 1, 2018, the Company adopted ASU 2016-18 “Statement of Cash Flows (Topic 230), Restricted Cash”. This standard requires that the statements of cash flows explain the changes in the combined total of restricted and unrestricted cash balances. Amounts generally described as restricted cash will be combined with unrestricted cash and cash equivalents when reconciling the beginning and end of period balances on the statements of cash flows. The Company adopted this standard retrospectively. Therefore, the balance of cash and cash equivalents was increased by $354,000 and $130,000 as of January 31, 2018 and 2017, respectively to reflect the respective restricted cash amounts. Net cash used in investing activities was adjusted to exclude the change in restricted cash of $224,000 and $76,000 for the years ended January 31, 2018 and 2017, respectively.

In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-02 “Leases (Codified as Topic 842)”. This standard requires that virtually all leases will be recognized by lessees on their balance sheet as a right-of-use asset and a corresponding lease liability, including leases currently accounted for as operating leases. The Company is required to adopt this standard effective February 1, 2019. The related leases are currently accounted for as operating leases (see Note 8). This standard requires a modified retrospective transition approach and allows for early adoption. This standard provides three practical expedients, which the Company intends to elect as a package and apply consistently to all leases. Pursuant to this package, the Company will not reassess i) whether any expired or existing contracts are or contain leases, ii) the lease classification for any expired or existing leases

that were previously classified as operating leases, or iii) initial direct costs for any existing leases. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements, which provides an option to apply the transition provisions of the new standard at the adoption date instead of the earliest comparative period presented in the financial statements. The Company will elect to use this optional transition method.

The Company expects the adoption of this new standard to result in the recognition of a range of approximately $18 million to $22 million in right-of-use assets and lease liabilities on the Consolidated Balance Sheet. The Company does not expect the adoption of this new standard to have a material impact on its Consolidated Statements of Operations Cash Flows or Shareholders’ Equity. The Company expects to use the lessee non-lease component accounting policy election, for all asset classes, to include both the lease and non-lease components as a single component and account for them as a lease.

The Company is currently working to complete the implementation of new processes and information technology tools to assist in ongoing lease data collection and analysis, and is updating accounting policies and internal controls in connection with the adoption of the new standard.

INVESTMENTS

12 Months Ended

Jan. 31, 2019

Investments Schedule [Abstract]

Investment [Text Block]

2.	INVESTMENTS

The Company’s equity method investment in Big River is accounted for under ASC 323. The following table summarizes the investment (amounts in thousands):

	January 31, 2019			January 31, 2018

Carrying amount	$	32,075		$	34,549

Ownership percentage		10.3	%		10.3	%

The Company invested $20.0 million in Big River which is a holding company for several entities. Big River, through its various entities (both wholly and partially owned), operates four ethanol manufacturing facilities, that combined shipped approximately 428.6 million gallons of ethanol in the twelve months ended January 31, 2019. The Company recorded income of approximately $1.5 million, $3.2 million and $6.1 million as its share of earnings from Big River during fiscal years 2018, 2017 and 2016, respectively. The Company received dividends of approximately $4.0 million, $6.5 million and $7.0 million from Big River during fiscal years 2018, 2017 and 2016, respectively. At January 31, 2019, the carrying value of the investment in Big River is approximately $32.1 million; the amount of underlying equity in the net assets of Big River is approximately $28.3 million.

Summarized financial information for the Company’s equity method investee as of and for its fiscal year end is presented in the following tables (amounts in thousands):

Big River

	December 31, 2018		December 31, 2017

Current assets	$	117,796	$	149,436
Non current assets		241,382		261,443
Total assets	$	359,178	$	410,879
Current liabilities	$	50,172	$	49,130
Long-term liabilities		701		10,599
Total liabilities	$	50,873	$	59,729
Noncontrolling interests	$	34,149	$	38,412

	Years Ended December 31,
Big River	2018		2017		2016

Net sales and revenue	$	802,523	$	817,112	$	851,434
Gross profit	$	33,782	$	60,259	$	88,841
Income from continuing operations	$	14,893	$	32,243	$	63,292
Net income	$	14,893	$	32,243	$	63,292

Big River has debt agreements that limit and restrict amounts the entity can pay in the form of dividends or advances to owners. The restricted net assets of Big River at January 31, 2019 are approximately $185.1 million; the Company’s proportionate share of restricted net assets of Big River is approximately $19.1 million.

The following table summarizes the Company’s held-to-maturity security at January 31, 2019 (amounts in thousands):

	Amortized Cost		Gross Unrealized Losses		Estimated Fair Value

United States Treasury Bill	$	14,975	$	2	$	14,973

As of January 31, 2019, the contractual maturity of this investment was less than one year. The yield to maturity rate is 2.29%.

The Company had no held-to-maturity investments as of January 31, 2018.

NET SALES AND REVENUE

12 Months Ended

Jan. 31, 2019

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

3.	NET SALES AND REVENUE

On February 1, 2018, the Company adopted the amended guidance in ASC Topic 606, “Revenue from Contracts with Customers”, and all related amendments and applied it to all contracts utilizing the modified retrospective method. There were no adjustments to the Consolidated Condensed Balance Sheet as of February 1, 2018 as a result of the adoption of this accounting guidance. Therefore, comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. Furthermore, there was no impact related to the adoption of this

accounting guidance on the Consolidated Statements of Operations or Balance Sheets for the year ended January 31, 2019. The Company expects the impact of adopting this accounting guidance to be immaterial on an ongoing basis.

The Company recognizes sales of products when obligations under the terms of the respective contracts with customers are satisfied. This occurs with the transfer of control of products, generally upon shipment from the ethanol plant or upon loading of the rail car used to transport the products. Revenue is measured as the amount of consideration expected to be received in exchange for transferring goods. Sales, value add and other taxes the Company collects concurrent with revenue producing activities are excluded from net sales and revenue.

The majority of the Company’s sales have payment terms ranging from 5 to 10 days after transfer of control. The Company has determined that sales contracts do not generally include a significant financing component. The Company has not historically, and does not intend to, enter into sales contracts in which payment is due from a customer prior to transferring product to the customer. Thus, the Company does not record unearned revenue.

The Company elected, pursuant to the new accounting guidance, to recognize as fulfillment activities the cost for shipping and handling activities that occur after the customer obtains control of the promised goods and not when performance obligations are met. See Note 16 for disaggregation of net sales and revenue by operating segment and by product.

BUSINESS COMBINATIONS

12 Months Ended

Jan. 31, 2019

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

4.	BUSINESS COMBINATIONS

On August 10, 2017, the Company, through a 95.35% owned subsidiary, purchased the entire ownership interest of an entity that owns a refined coal facility. The Company began operating its refined coal facility immediately after the acquisition. The Company expects that the refined coal operating results will be subsidized by federal production tax credits through November 2021, subject to meeting qualified emissions reductions and other requirements as governed by Section 45 of the Internal Revenue Code.

The results of the Company’s refined coal operations (approximately $1.2 million of net sales and revenue and approximately $15.8 million of net income attributable to REX common shareholders, including the income tax benefit of estimated Section 45 credits to be earned) have been included in the consolidated financial statements subsequent to the acquisition date and are included in the Company’s refined coal segment. Pro forma net sales and revenue and net income attributable to REX common shareholders, had the acquisition occurred on February 1, 2017 would have been $452.6 million and $38.9 million, respectively for the year ended January 31, 2018.

The purchase price was $12,049,000, which was paid in cash. The acquisition was recorded by allocating the total purchase price to the assets acquired, based on their estimated fair values at the acquisition date. The income approach was used to determine the fair values of assets acquired. The following table summarizes the estimated fair values of the assets acquired at the acquisition date (amounts in thousands):

Inventory	$	49
Property, plant and equipment		12,000
Total assets acquired and purchase price	$	12,049

Transaction costs totaled approximately $2.5 million during fiscal year 2017 and are included in selling, general and administrative expenses in the Consolidated Statement of Operations.

FAIR VALUE

12 Months Ended

Jan. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

5.	FAIR VALUE

The Company applies ASC 820, “Fair Value Measurements and Disclosures” (“ASC 820”) which defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

The Company determines the fair market values of its financial instruments based on the fair value hierarchy established by ASC 820, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair values which are provided below. The Company carries certain cash equivalents, investments and derivative financial instruments at fair value.

Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt and equity securities and derivative contracts that are traded in an active exchange market, as well as certain U.S. Treasury securities that are highly liquid and are actively traded in over-the-counter markets.

Level 2 – Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include derivative contracts whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally or corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methods, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Unobservable inputs are developed based on the best information available, which may include the Company’s own data.

The fair values of derivative assets and liabilities traded in the over-the-counter market are determined using quantitative models that require the use of multiple market inputs including interest rates, prices and indices to generate pricing and volatility factors, which are used to value the position. The predominance of market inputs are actively quoted and can be validated through external sources, including brokers, market transactions and third-party pricing services. Estimation risk is greater for derivative asset and liability positions that are either option-based or have longer maturity dates where observable market inputs are less readily available or are unobservable, in which case interest rate, price or index scenarios are extrapolated in order to determine the fair value. The fair values of derivative assets and liabilities include adjustments for market liquidity, counterparty credit quality, the Company’s own credit standing and other specific factors, where appropriate. The fair values of property and equipment are determined by using various models that discount future expected cash flows.

To ensure the prudent application of estimates and management judgment in determining the fair value of derivative assets and liabilities and property and equipment, various processes and controls have been adopted, which include: (i) model validation that requires a review and approval for pricing, financial statement fair value determination and risk quantification; and (ii) periodic review and substantiation of profit and loss reporting for all derivative instruments. Financial assets and liabilities measured at fair value at January 31, 2019 on a recurring basis are summarized below (amounts in thousands):

	Level 1		Level 2		Level 3		Total Fair Value
Commodity futures (3)	$	—	$	44	$	—	$	44
Investment in cooperative (1)		—		—		333		333
Total assets	$	—	$	44	$	333	$	377

Forward purchase contracts liability (5)	$	—	$	22	$	—	$	22

Financial assets and liabilities measured at fair value at January 31, 2018 on a recurring basis are summarized below (amounts in thousands):

	Level 1		Level 2		Level 3		Total Fair Value
Forward purchase contracts asset (4)	$	—	$	72	$	—	$	72
Investment in cooperative (1)		—		—		333		333
Total assets	$	—	$	72	$	333	$	405

Commodity futures (5)	$	—	$	87	$	—	$	87
Forward purchase contracts liability (2)		—		34		—		34
Total liabilities	$	—	$	121	$	—	$	121

	(1)	The investment in cooperative is included in “Other assets” on the accompanying Consolidated Balance Sheets.

	(2)	The forward purchase contract liability is included in “Accrued expenses and other current liabilities” on the accompanying Consolidated Balance Sheets.

	(3)	The commodity futures asset is included in “Prepaid expenses and other” on the accompanying Consolidated Balance Sheets.

	(4)	The forward purchase contract asset is included in “Prepaid expenses and other” on the accompanying Consolidated Balance Sheets.

	(5)	The commodity futures liability is included in “Accrued expenses and other current liabilities” on the accompanying Consolidated Balance Sheets.

The Company determined the fair value of the investment in cooperative by using a discounted cash flow analysis on the expected cash flows. Inputs used in the analysis include the face value of the allocated equity amount, the projected term for repayment based upon a historical trend, and a risk adjusted discount rate based on the expected compensation participants would demand because of the uncertainty of the future cash flows. The inherent risk and uncertainty associated with unobservable inputs could have a significant effect on the actual fair value of the investment.

No other financial instruments were elected to be measured at fair value in accordance with ASC 470-20-25-21.

There were no assets measured at fair value at January 31, 2019 and 2018 on a non-recurring basis. As discussed in Note 4, the Company estimated the fair values of refined coal assets acquired using the income approach. This estimated fair value is a level 3 measurement.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

OTHER ASSETS

12 Months Ended

Jan. 31, 2019

Disclosure Text Block Supplement [Abstract]

Other Assets Disclosure [Text Block]

6.	OTHER ASSETS

The components of other noncurrent assets are as follows (amounts in thousands):

	January 31,
	2019		2018

Deferred taxes	$	5,843	$	—
Real estate taxes refundable		—		6,719
Other		333		735

Total	$	6,176	$	7,454

Real estate taxes refundable represent amounts due One Earth associated with refunds of previously paid taxes in connection with a tax increment financing arrangement with local taxing authorities.

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

12 Months Ended

Jan. 31, 2019

Disclosure Text Block Supplement [Abstract]

Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]

7.	ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

The components of accrued expenses and other current liabilities at January 31, 2019 and 2018 are as follows (amounts in thousands):

	January 31,
	2019		2018

Accrued payroll and related items	$	2,041	$	5,108
Accrued utility charges		2,924		2,639
Accrued transportation related items		1,567		1,561
Accrued real estate taxes		1,680		2,678
Accrued income taxes		71		61
Other		1,263		1,669

Total	$	9,546	$	13,716

LEASES

12 Months Ended

Jan. 31, 2019

Leases [Abstract]

Leases of Lessee Disclosure [Text Block]

LEASES

At January 31, 2019, the Company has lease agreements, as lessee, for rail cars and other equipment. All of the leases are accounted for as operating leases. As of January 31, 2019, future minimum annual rentals on such leases are as follows (amounts in thousands):

Years Ended	Minimum
January 31,	Rentals

2019		6,767
2020		5,487
2021		4,791
2022		3,208
2023		2,041
Thereafter		1,221
	$	23,515

COMMON STOCK

12 Months Ended

Jan. 31, 2019

Stockholders' Equity Note [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

9.	COMMON STOCK

During fiscal years 2018 and 2016, the Company purchased 305,473 shares and 87,904 shares, respectively, of its common stock for approximately $21,856,000 and $4,353,000, respectively. During fiscal year 2017, the Company did not purchase any of its common stock. At January 31, 2019, the Company had prior authorization by its Board of Directors to purchase, in open market transactions, an additional 349,861 shares of its common stock. Information regarding the Company’s common stock is as follows (amounts in thousands):

	January 31,
	2019		2018
Authorized shares		45,000		45,000
Issued shares		29,853		29,853
Outstanding shares		6,274		6,566

REVOLVING LINES OF CREDIT

12 Months Ended

Jan. 31, 2019

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

10.	REVOLVING LINES OF CREDIT

One Earth and NuGen each have $10.0 million revolving loan facilities that mature June 1, 2019. Any borrowings will be secured by the inventory and accounts receivable of One Earth or NuGen, specific to which entity borrows money under these facilities. These revolving loan facilities are recourse only to One Earth and NuGen, respectively, and not to REX American Resources Corporation or any of its other subsidiaries. Borrowings under these facilities bear interest at the one month LIBOR rate plus 225 basis points. Neither One Earth nor NuGen had outstanding borrowings on the revolving loans during the years ended January 31, 2019 or 2018.

DERIVATIVE FINANCIAL INSTRUMENTS

12 Months Ended

Jan. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities Disclosure [Text Block]

11.	DERIVATIVE FINANCIAL INSTRUMENTS

The Company is exposed to various market risks, including changes in commodity prices (raw materials and finished goods). To manage risks associated with the volatility of these natural business exposures, the Company enters into commodity agreements and forward purchase (corn) and sale (ethanol, distillers grains and non-food grade corn oil) contracts. The Company does not purchase or sell derivative financial instruments for trading or speculative purposes. The Company does not purchase or sell derivative financial instruments for which a lack of marketplace quotations would require the use of fair value estimation techniques. The changes in fair value of these derivative financial instruments are recognized in current period earnings as the Company does not use hedge accounting.

The following table provides information about the fair values of the Company’s derivative financial instruments and the line items on the Consolidated Balance Sheets in which the fair values are reflected (in thousands):

	Asset Derivatives				Liability Derivatives
	Fair Value at January 31,				Fair Value at January 31,
	2019		2018		2019		2018

Commodity futures (1)	$	44	$	—	$	—	$	87
Forward purchase contracts (2)	$	—	$	72	$	22	$	34

(1)

Commodity futures assets are included in prepaid expense and other. Commodity futures liabilities are included in accrued expenses and other current liabilities. These contracts are short/sell positions for approximately 2.0 million bushels of corn at January 31, 2019. These contracts are short/sell positions for approximately 2.5 million bushels of corn and approximately 2.8 million gallons of ethanol and long/buy positions for approximately 2.8 million gallons of ethanol at January 31, 2018.

(2)

Forward purchase contracts liabilities are included in accrued expenses and other current liabilities while forward purchase contracts assets are included in prepaid expenses and other. These contracts are for purchases of approximately 1.3 million bushels of corn at January 31, 2019 and 11.7 million bushels of corn at January 31, 2018.

As of January 31, 2019 and 2018, all of the derivative financial instruments held by the Company were subject to enforceable master netting arrangements. The Company’s accounting policy is to offset positions owed or owing with the same counterparty. As of January 31, 2019 and 2018, the gross positions of the enforceable master netting agreements are not significantly different from the net positions presented in the table above. Depending on the amount of an unrealized loss on a derivative contract held by the Company, the counterparty may require collateral to secure the Company’s derivative contract position. As of January 31, 2019, the Company was required to maintain collateral with the counterparty in the amount of approximately $281,000 to secure the Company’s derivative liability position. See Note 5 which contains fair value information related to derivative financial instruments.

The Company recognized gains (included in cost of sales) on derivative financial instruments of approximately $2,698,000, $1,317,000 and $2,131,000 in fiscal years 2018, 2017 and 2016, respectively.

EMPLOYEE BENEFITS

12 Months Ended

Jan. 31, 2019

Disclosure Text Block Supplement [Abstract]

Compensation and Employee Benefit Plans [Text Block]

12.

EMPLOYEE BENEFITS

The Company maintains the REX 2015 Incentive Plan, approved by its shareholders, which reserves a total of 550,000 shares of common stock for issuance pursuant to its terms. The plan provides for the granting of shares of stock, including options to purchase shares of common stock, stock appreciation rights tied to the value of common stock, restricted stock, and restricted stock unit awards to eligible employees, non-employee directors and consultants. The Company measures share-based compensation grants at fair value on the grant date, adjusted for estimated forfeitures. The Company records noncash compensation expense related to liability and equity awards in its consolidated financial statements over the requisite service period on a straight-line basis. At January 31, 2019, 489,430 shares remain available for issuance under the Plan. As a component of their compensation, restricted stock has been granted to directors at the market price of REX common stock on the date of the grant. In addition one third of executives’ incentive compensation is payable by an award of restricted stock based on the then market

price of REX common stock. The Company’s board of directors has determined that the grant date will be June 15^th, or the next business day, for all grants of restricted stock.

At January 31, 2019 and 2018, unrecognized compensation cost related to nonvested restricted stock was approximately $200,000 and $233,000, respectively. The following table summarizes non-vested restricted stock award activity for fiscal years 2018, 2017 and 2016:

	2018
	Non-Vested Shares		Weighted Average Grant Date Fair Value (000’s)		Weighted Average Remaining VestingTerm (in years)

Non-Vested at January 31, 2018		29,415	$	2,275		2
Granted		21,744		1,623
Forfeited		—		—
Vested		13,123		963

Non-Vested at January 31, 2019		38,036	$	2,935		2

	2017
	Non-Vested Shares		Weighted Average Grant Date Fair Value (000’s)		Weighted Average Remaining VestingTerm (in years)

Non-Vested at January 31, 2017		23,350	$	1,386		2
Granted		14,156		1,370
Forfeited		—		—
Vested		8,091		481

Non-Vested at January 31, 2018		29,415	$	2,275		2

	2016
	Non-Vested Shares		Weighted Average Grant Date Fair Value (000’s)		Weighted Remaining Vesting Vesting Term (in years)

Non-Vested at January 31, 2016		3,168	$	200		2
Granted		21,502		1,269
Forfeited		—		—
Vested		1,320		83

Non-Vested at January 31, 2017		23,350	$	1,386		2

The above tables include 34,148, 24,711 and 18,541 non-vested shares at January 31, 2019, 2018 and 2017, respectively, which are included in the number of weighted average shares outstanding used to determine basic and diluted earnings per share attributable to REX common shareholders. Such shares are treated, for accounting purposes, as being fully vested at the grant date as they were granted to officers who were retirement eligible at the time of grant.

Commitments

12 Months Ended

Jan. 31, 2019

Disclosure Text Block Supplement [Abstract]

Commitments Disclosure [Text Block]

13.

COMMITMENTS

One Earth and NuGen have combined forward purchase contracts for approximately 13.0 million bushels of corn, the principal raw material for their ethanol plants. They expect to take delivery of a majority of the corn through June 2019.

One Earth and NuGen have combined sales commitments for approximately 32.3 million gallons of ethanol, 88,000 tons of distillers grains and 18.2 million pounds of non-food grade corn oil. They expect to deliver the ethanol, distillers grains and corn oil through March 2019.

One Earth has entered into an agreement with an unrelated party for the use of a portion of the party’s natural gas pipeline. The term of the agreement is 10 years, and the amount is $4,380,000, which is paid over 120 equal monthly installments of $36,500 beginning in February 2009. A 15 year agreement, with monthly payments of $29,250 will be effective February 1, 2019. One Earth paid approximately $438,000 pursuant to the agreement in each of fiscal years 2018, 2017 and 2016.

One Earth and NuGen have entered into agreements with unrelated parties for the lease of railcars used to ship ethanol and distillers grains. These leases expire on various dates through February 1, 2025. One Earth and NuGen pay a monthly lease amount per railcar. One Earth and NuGen incurred combined expenses of approximately $8,109,000, $8,600,000 and $8,515,000 pursuant to the leases in fiscal years 2018, 2017 and 2016, respectively.

One Earth and NuGen each have a contract with an unrelated party (“Distillers Grains Marketers”) for distillers grains marketing services. Under the terms of the contracts, the Distillers Grains Marketers will purchase all of One Earth’s and NuGen’s distillers grains production during the term of the contracts. The contracts call for One Earth and NuGen to pay a fee per ton of distillers grains for the Distillers Grains Marketers’ services. The terms of the agreements are for one year and shall renew automatically for additional one year terms, unless either party sends notice to the other party of its intent to terminate the agreement at least 90 days prior to the expiration of the then current term of the agreement. One Earth and NuGen combined incurred fees of approximately $1,250,000, $1,354,000 and $1,194,000 in fiscal years 2018, 2017 and 2016, respectively, for these marketing services.

One Earth has a grain origination agreement with a minority equity owner, under which it purchased 100% of its grain during fiscal years 2018, 2017 and 2016. Pursuant to this agreement, One Earth pays a procurement fee per bushel. The agreement expires December 31, 2020, and can be terminated prior to the expiration date if either party provides 180 days written notice. The agreement automatically renews for additional one year terms, unless either party sends notice to the other party of its intent to terminate the agreement at least 180 days prior to the expiration of the then current term of the agreement.

The refined coal entity has various agreements (site license, operating agreements, etc.) containing payment terms based upon production of refined coal under which the Company is required to pay various fees. These fees totaled approximately $9.9 million and $5.5 million in fiscal years 2018 and 2017, respectively.

Income Taxes

12 Months Ended

Jan. 31, 2019

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

14.

INCOME TAXES

The (benefit) provision for income taxes for fiscal years 2018, 2017 and 2016 consist of the following (amounts in thousands):

	2018			2017			2016

Federal:
Current	$	81		$	(2,094	)	$	12,197
Deferred		(23,547	)		(19,528	)		3,568

		(23,466	)		(21,622	)		15,765

State and Local:
Current		361			1,180			2,153
Deferred		183			923			(525	)

		544			2,103			1,628

(Benefit) provision for income taxes	$	(22,922	)	$	(19,519	)	$	17,393

The tax effects of significant temporary differences representing deferred tax assets and liabilities are as follows (amounts in thousands):

	January 31,
	2019			2018

Assets:
General business credit carryforward	$	26,523		$	3,897
Accrued liabilities		308			687
State net operating loss carryforward		294			241
Other items		647			576
Valuation allowance		(232	)		(241	)

Total		27,540			5,160
Liabilities:
Basis in pass through entities, including depreciation		(25,725	)		(26,717	)
Other		(157	)		(149	)

Total		(25,882	)		(26,866	)
Net deferred tax asset (liability)	$	1,658		$	(21,706	)

The Company has a general business credit carryforward of approximately $26.5 million and approximately $3.9 million at January 31, 2019 and 2018, respectively. The Company can carry these credits forward for up to twenty years. The carryforward period begins to expire in fiscal year 2037.

The Company has a valuation allowance of approximately $232,000 and $241,000 at January 31, 2019 and 2018, respectively. The Company decreased the valuation allowance by $9,000, $176,000 and $734,000 in fiscal years 2018, 2017 and 2016, respectively. These adjustments to the valuation allowance are a result of estimates of realizing certain future state tax benefits.

The Tax Act signed into law on December 22, 2017, reduced the federal corporate income tax rate to 21% effective January 1, 2018. The Tax Act also makes numerous other changes to the U.S. tax code, including, but not limited to, permitting full expensing of qualified property acquired after September 27, 2017, and expanding prior limitations on the deductibility of certain executive compensation.

The SEC issued Staff Account bulleting 118 (“SAB 118”), which provides guidance on accounting for the tax effects of the Tax Act. In recognition of the inherent complexities associated with accounting for the effects of the Tax Act, SAB 118 provides a measurement period of up to one year from enactment of the Tax Act for companies to complete the accounting for the tax effects of the Tax Act. Although the accounting for the tax effects of the Tax Act was not yet complete, at January 31, 2018 the Company made a preliminary estimate of the effect of the tax rate reducing on the existing deferred tax balances and recorded a tax benefit of approximately $14,362,000 to remeasure the deferred tax liability at the new 21% rate. The Company finalized its analysis in fiscal year 2018, and as a result, recorded a tax provision of approximately $272,000.

Through its refined coal operation, the Company earns production tax credits pursuant to IRC Section 45. The credits can be used to reduce future income tax liabilities for up to 20 years. These credits increased the income tax benefit by approximately $21.2 million and $11.5 million during fiscal years 2018 and 2017, respectively.

During fiscal year 2018, the company recognized an income tax benefit (net of uncertain tax position expense) of approximately $4.6 million for federal and state research and experimentation credits. These credits recorded during fiscal year 2018 related to fiscal years 2014 to 2017 as well as an estimated tax benefit for fiscal year 2018.

The Company paid income taxes of approximately $855,000, $6,920,000 and $7,090,000 in fiscal years 2018, 2017 and 2016, respectively. The Company received refunds of income taxes of approximately $1,132,000, $476,000 and $150,000 in fiscal years 2018, 2017 and 2016, respectively.

The effective income tax rate on consolidated pre-tax income or loss differs from the federal income tax statutory rate for fiscal years 2018, 2017 and 2016 as follows:

	2018			2017			2016

Federal income tax at statutory rate		21.0	%		33.8	%		35.0	%
State and local taxes, net of federal tax benefit		3.6			3.2			2.3
Section 45 production tax credits		(145.2	)		(45.4	)		—
Research and experimentation credits		(77.8	)		—			—
Tax Cuts and Jobs Act		1.9			(56.6	)		—
Domestic production activities deduction		—			(5.9	)		(2.9	)
Uncertain tax positions		47.1			1.4			0.8
Noncontrolling interest		(9.9	)		(7.6	)		(4.6	)
Other		2.2			0.2			—

Total		(157.1	)%		(76.9	)%		30.6	%

The Company files a U.S. federal income tax return and income tax returns in various states. In general, the Company is no longer subject to U.S. federal, state or local income tax examinations by tax authorities for fiscal years ended January 31, 2014 and prior.

The Company applies the provisions of ASC 740-10-25-5 for uncertain tax positions. As of January 31, 2019, total unrecognized tax benefits were approximately $8,785,000, and accrued penalties and interest were approximately $447,000. If the Company were to prevail on all unrecognized tax benefits recorded, the provision for income taxes would be reduced by approximately $8,304,000. In addition, the impact of penalties and interest would also benefit the effective tax rate. Interest and penalties associated with unrecognized tax benefits are recorded within income tax expense.

On a quarterly and annual basis, the Company accrues for the effects of open uncertain tax positions and the related potential penalties and interest. It is reasonably possible that the amount of the unrecognized tax benefit with respect to certain unrecognized tax positions will increase or decrease during the next 12 months; however, the Company does not expect the change to have a material effect on results of operations or financial position. A reconciliation of the beginning and ending amount of unrecognized tax benefits, including interest and penalties, is as follows (dollars in thousands):

	Fiscal Year
	2018		2017

Unrecognized tax benefits, beginning of year	$	2,325	$	2,096
Changes for tax positions for prior years		5,973		269
Changes for tax positions for current year		934		(40	)

Unrecognized tax benefits, end of year	$	9,232	$	2,325

CONTINGENCIES

12 Months Ended

Jan. 31, 2019

Loss Contingency [Abstract]

Contingencies Disclosure [Text Block]

15.

CONTINGENCIES

The Company is involved in various legal actions arising in the normal course of business. After taking into consideration legal counsels’ evaluation of such actions, management is of the opinion that their outcome will not have a material effect on the Company’s consolidated financial statements. There were no liabilities recorded at January 31, 2019 or 2018 as the Company did not believe that there was a probable and reasonably estimable loss associated with any legal contingencies.

Segment Reporting

12 Months Ended

Jan. 31, 2019

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

16.

SEGMENT REPORTING

In the third quarter of fiscal year 2017, the Company began reporting the results of its refined coal operations as a new segment as a result of the refined coal acquisition (see Note 3). The Company has two segments: ethanol and by-products and refined coal. Historical amounts have been reclassified to conform to the current year segment reporting presentation. The Company evaluates the performance of each reportable segment based on net income attributable to REX common shareholders. The following tables summarize segment and other results and assets (amounts in thousands):

	Fiscal Year
	2018			2017			2016

Net sales and revenue:

Ethanol and by-products	$	485,885		$	452,153		$	453,799
Refined coal ¹		786			433			—
Total net sales and revenue	$	486,671		$	452,586		$	453,799

Segment gross profit (loss):

Ethanol and by-products	$	43,856		$	51,509		$	71,039
Refined coal		(13,641	)		(7,348	)		—
Total gross profit	$	30,215		$	44,161		$	71,039

Income (loss) before income taxes:

Ethanol and by-products	$	31,545		$	38,352		$	59,447
Refined coal		(15,204	)		(10,021	)		—
Corporate and other		(1,753	)		(2,938	)		(2,536	)
Total income before income taxes	$	14,588		$	25,393		$	56,911

Benefit (provision) for income taxes:

Ethanol and by-products	$	(2,343	)	$	3,245		$	(18,259	)
Refined coal		24,674			15,168			—
Corporate and other		591			1,106			866
Total benefit (provision) for income taxes	$	22,922		$	19,519		$	(17,393	)

Segment profit (loss):

Ethanol and by-products	$	23,346		$	35,880		$	33,950
Refined coal		10,148			5,628			—
Corporate and other		(1,849	)		(1,802	)		(1,617	)
Net income attributable to REX common shareholders	$	31,645		$	39,706		$	32,333

¹Sales in the refined coal segment are recorded net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.

	Fiscal Year
	2018		2017			2016

Sales of products, ethanol and by-products segment:

Ethanol	$	368,319	$	359,239		$	358,349
Dried distillers grains		85,417		63,120			71,204
Non-food grade corn oil		20,097		21,195			18,518
Modified distillers grains		11,950		8,525			5,326
Other		102		74			402
Total sales	$	485,885	$	452,153		$	453,799

Sales of products, refined coal segment:

Refined coal	$	786	$	433		$	—

Interest income:

Ethanol and by-products	$	2,460	$	878		$	212
Refined coal		—		—			—
Corporate and other		1,054		678			222
Total interest income	$	3,514	$	1,556		$	434

Depreciation expense:

Ethanol and by-products	$	22,004	$	20,037		$	19,464
Refined coal		2,784		1,385			—
Corporate and other		40		40			55
Total depreciation expense	$	24,828	$	21,462		$	19,519

Equity in income of unconsolidated affiliates:

Ethanol and by-products	$	1,536	$	3,232		$	6,144
Refined coal		—		—			—
Corporate and other		—		—			—
Total equity in income of unconsolidated affiliates	$	1,536	$	3,232		$	6,144

(Loss) gain on sale of investment:

Ethanol and by-products	$	—	$	(13	)	$	192
Refined coal		—		—			—
Corporate and other		—		—			—
Total gain on sale of investment	$	—	$	(13	)	$	192

	January 31,
Assets:	2019		2018

Ethanol and by-products	$	393,691	$	384,997
Refined coal		8,625		12,165
Corporate and other		69,077		81,702
Total assets	$	471,393	$	478,864

Additions to other long lived assets:

Ethanol and by-products	$	—	$	796
Refined coal		—		—
Corporate and other		—		—
Total additions to other long lived assets	$	—	$	796

Additions to property and equipment:

Ethanol and by-products	$	10,697	$	24,017
Refined coal		78		—
Corporate and other		—		—
Total additions to property and equipment	$	10,775	$	24,017

All of the Company’s ethanol and distillers grains are sold in the domestic market. The Company’s customers make all decisions with regard to where products they purchase from the Company are distributed.

QUARTERLY UNAUDITED INFORMATION

12 Months Ended

Jan. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

17.

QUARTERLY UNAUDITED INFORMATION

The following tables set forth the Company’s net sales and revenue, gross profit, net income and net income per share (basic and diluted) for each quarter during the last two fiscal years. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.

	Quarters Ended (In Thousands, Except Per Share Amounts)
	April 30,		July 31,		October 31,		January 31,
	2018		2018		2018		2019

Net sales and revenue	$	120,820	$	128,757	$	123,750	$	113,344
Gross profit		10,851		9,399		7,747		2,218
Net income		10,352		10,490		13,769		2,899
Net income attributable to REX common shareholders		9,496		9,217		11,875		1,057
Basic and diluted net income per share attributable to REX common shareholders	$	1.45	$	1.43	$	1.86	$	0.17

		Quarters Ended (In Thousands, Except Per Share Amounts)
		April 30,		July 31,		October 31,		January 31,
		2017		2017		2017		2018

Net sales and revenue	$	113,143	$	108,744	$	121,164	$	109,535
Gross profit		12,489		10,781		14,867		6,024
Net income		5,612		4,171		14,994		20,135
Net income attributable to REX common shareholders		4,544		2,941		13,168		19,053
Basic and diluted net income per share attributable to REX common shareholders (a)	$	0.69	$	0.45	$	2.00	$	2.89

The total of the quarterly net income per share amounts do not equal the annual net income per share amounts due to the impact of varying amounts of shares outstanding during the year.

RELATED PARTIES

12 Months Ended

Jan. 31, 2019

18.

RELATED PARTIES

During fiscal years 2018, 2017 and 2016, One Earth and NuGen purchased approximately $176.8 million, $154.5 million and $148.5 million, respectively, of corn from minority equity investors. The Company had amounts payable to related parties for corn purchases of approximately $1.9 million and $0.9 million at January 31, 2019 and 2018, respectively.

During fiscal years 2018 and 2017, the Company recognized commission expense of approximately $0.8 million and approximately $1.8 million, respectively, payable to the minority investor in the refined coal entity. The commission expense is associated with the refined coal acquisition. The Company had accrued liabilities related to the commission expense of approximately $1.6 million and approximately $1.5 million at January 31, 2019 and 2018, respectively.

During fiscal years 2018 and 2017, the Company received approximately $0.5 million and approximately $0.9 million, respectively, in capital contributions from the minority investor in the refined coal entity.

Schedule II - VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Jan. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Schedule II - VALUATION AND QUALIFYING ACCOUNTS

FOR THE YEARS ENDED JANUARY 31, 2019, 2018 AND 2017

(Amounts in thousands)

			Additions		Deductions
	Balance		Charged to		Charges for		Balance
	Beginning		Cost and		Which Reserves		End
	of Year		Expenses		Were Created		of Year

2019:
Deferred tax valuation allowance	$	241	$	—	$	9	$	232

2018:
Deferred tax valuation allowance	$	417	$	—	$	176	$	241

2017:
Deferred tax valuation allowance	$	1,151	$	—	$	734	$	417

Accounting Policies, by Policy (Policies)

12 Months Ended

Jan. 31, 2019

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

Fiscal Period, Policy [Policy Text Block]

Segment Reporting, Policy [Policy Text Block]

Use of Estimates, Policy [Policy Text Block]

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash Equivalents – Cash equivalents are principally short-term investments with original maturities of less than three months. The carrying amount of cash equivalents approximates fair value.

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Inventory, Policy [Policy Text Block]

	January 31,
	2019		2018

Ethanol and other finished goods	$	5,767	$	8,402
Work in process		3,094		2,824
Grain and other raw materials		9,616		9,529

Total	$	18,477	$	20,755

Property, Plant and Equipment, Policy [Policy Text Block]

	January 31,
	2019			2018

Land and improvements	$	21,469		$	21,074
Buildings and improvements		23,608			23,272
Machinery, equipment and fixtures		297,807			288,832
Construction in progress		708			3,155

		343,592			336,333
Less: accumulated depreciation		(161,071	)		(138,506	)

Total	$	182,521		$	197,827

Depreciation expense was approximately $24,828,000, $21,462,000 and $19,519,000 in fiscal years 2018, 2017 and 2016, respectively.

Investment, Policy [Policy Text Block]

Short-term investments, consisting of U.S. government obligations, are considered held-to-maturity, and, therefore are carried at amortized historical cost.

Revenue Recognition, Policy [Policy Text Block]

Cost of Sales, Policy [Policy Text Block]

Selling, General and Administrative Expenses, Policy [Policy Text Block]

Fair Value of Financial Instruments, Policy [Policy Text Block]

Share-based Compensation, Option and Incentive Plans, Director Policy [Policy Text Block]

Income Tax, Policy [Policy Text Block]

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income – The Company has no components of other comprehensive income, and therefore, comprehensive income equals net income.

New Accounting Pronouncements, Policy [Policy Text Block]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Jan. 31, 2019

Accounting Policies [Abstract]

Interest and Other Income [Table Text Block]

Interest and other income, net includes the following (amounts in thousands)

	Fiscal Year 2018			Fiscal Year 2017			Fiscal Year 2016

Interest income	$	3,514		$	1,556		$	434
(Loss) gain on sale of investment		—			(13	)		192
(Loss) gain on disposal of real estate and property and equipment, net		(104	)		(192	)		328
Other		(22	)		709			162
Total	$	3,388		$	2,060		$	1,116

Schedule of Inventory, Current [Table Text Block]

The components of inventory are as follows (amounts in thousands):

	January 31,
	2019		2018

Ethanol and other finished goods	$	5,767	$	8,402
Work in process		3,094		2,824
Grain and other raw materials		9,616		9,529

Total	$	18,477	$	20,755

Property, Plant and Equipment [Table Text Block]

The components of property and equipment are as follows (amounts in thousands):

	January 31,
	2019			2018

Land and improvements	$	21,469		$	21,074
Buildings and improvements		23,608			23,272
Machinery, equipment and fixtures		297,807			288,832
Construction in progress		708			3,155

		343,592			336,333
Less: accumulated depreciation		(161,071	)		(138,506	)

Total	$	182,521		$	197,827

INVESTMENTS (Tables)

12 Months Ended

Jan. 31, 2019

Investments Schedule [Abstract]

Equity Method Investments [Table Text Block]

The following table summarizes the investment (amounts in thousands):

	January 31, 2019			January 31, 2018

Carrying amount	$	32,075		$	34,549

Ownership percentage		10.3	%		10.3	%

Condensed Balance Sheet [Table Text Block]

Summarized financial information for the Company’s equity method investee as of and for its fiscal year end is presented in the following tables (amounts in thousands):

Big River

	December 31, 2018		December 31, 2017

Current assets	$	117,796	$	149,436
Non current assets		241,382		261,443
Total assets	$	359,178	$	410,879
Current liabilities	$	50,172	$	49,130
Long-term liabilities		701		10,599
Total liabilities	$	50,873	$	59,729
Noncontrolling interests	$	34,149	$	38,412

Schedule of Financial Information for Equity Method Investments [Table Text Block]

The following table summarizes the Company’s held-to-maturity security at January 31, 2019 (amounts in thousands):

	Years Ended December 31,
Big River	2018		2017		2016

Net sales and revenue	$	802,523	$	817,112	$	851,434
Gross profit	$	33,782	$	60,259	$	88,841
Income from continuing operations	$	14,893	$	32,243	$	63,292
Net income	$	14,893	$	32,243	$	63,292

Debt Securities, Held-to-maturity [Table Text Block]

The following table summarizes the Company’s held-to-maturity security at January 31, 2019 (amounts in thousands):

	Amortized Cost		Gross Unrealized Losses		Estimated Fair Value

United States Treasury Bill	$	14,975	$	2	$	14,973

BUSINESS COMBINATIONS (Tables)

12 Months Ended

Jan. 31, 2019

Business Combinations [Abstract]

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

The following table summarizes the estimated fair values of the assets acquired at the acquisition date (amounts in thousands):

Inventory	$	49
Property, plant and equipment		12,000
Total assets acquired and purchase price	$	12,049

FAIR VALUE (Tables)

12 Months Ended

Jan. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

Financial assets and liabilities measured at fair value at January 31, 2019 on a recurring basis are summarized below (amounts in thousands):

	Level 1		Level 2		Level 3		Total Fair Value
Commodity futures (3)	$	—	$	44	$	—	$	44
Investment in cooperative (1)		—		—		333		333
Total assets	$	—	$	44	$	333	$	377

Forward purchase contracts liability (5)	$	—	$	22	$	—	$	22

	Level 1		Level 2		Level 3		Total Fair Value
Forward purchase contracts asset (4)	$	—	$	72	$	—	$	72
Investment in cooperative (1)		—		—		333		333
Total assets	$	—	$	72	$	333	$	405

Commodity futures (5)	$	—	$	87	$	—	$	87
Forward purchase contracts liability (2)		—		34		—		34
Total liabilities	$	—	$	121	$	—	$	121

	(1)	The investment in cooperative is included in “Other assets” on the accompanying Consolidated Balance Sheets.

	(2)	The forward purchase contract liability is included in “Accrued expenses and other current liabilities” on the accompanying Consolidated Balance Sheets.

	(3)	The commodity futures asset is included in “Prepaid expenses and other” on the accompanying Consolidated Balance Sheets.

	(4)	The forward purchase contract asset is included in “Prepaid expenses and other” on the accompanying Consolidated Balance Sheets.

	(5)	The commodity futures liability is included in “Accrued expenses and other current liabilities” on the accompanying Consolidated Balance Sheets.

OTHER ASSETS (Tables)

12 Months Ended

Jan. 31, 2019

Disclosure Text Block Supplement [Abstract]

Schedule of Other Assets [Table Text Block]

The components of other noncurrent assets are as follows (amounts in thousands):

	January 31,
	2019		2018

Deferred taxes	$	5,843	$	—
Real estate taxes refundable		—		6,719
Other		333		735

Total	$	6,176	$	7,454

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)

12 Months Ended

Jan. 31, 2019

Disclosure Text Block Supplement [Abstract]

Other Current Liabilities [Table Text Block]

The components of accrued expenses and other current liabilities at January 31, 2019 and 2018 are as follows (amounts in thousands):

	January 31,
	2019		2018

Accrued payroll and related items	$	2,041	$	5,108
Accrued utility charges		2,924		2,639
Accrued transportation related items		1,567		1,561
Accrued real estate taxes		1,680		2,678
Accrued income taxes		71		61
Other		1,263		1,669

Total	$	9,546	$	13,716

LEASES (Tables)

12 Months Ended

Jan. 31, 2019

Leases [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

As of January 31, 2019, future minimum annual rentals on such leases are as follows (amounts in thousands):

Years Ended	Minimum
January 31,	Rentals

2019		6,767
2020		5,487
2021		4,791
2022		3,208
2023		2,041
Thereafter		1,221
	$	23,515

COMMON STOCK (Tables)

12 Months Ended

Jan. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class [Table Text Block]

Information regarding the Company’s common stock is as follows (amounts in thousands):

	January 31,
	2019		2018
Authorized shares		45,000		45,000
Issued shares		29,853		29,853
Outstanding shares		6,274		6,566

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

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+ Details

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Jan. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Assets at Fair Value [Table Text Block]

	Asset Derivatives				Liability Derivatives
	Fair Value at January 31,				Fair Value at January 31,
	2019		2018		2019		2018

Commodity futures (1)	$	44	$	—	$	—	$	87
Forward purchase contracts (2)	$	—	$	72	$	22	$	34

(1)

(2)

EMPLOYEE BENEFITS (Tables)

12 Months Ended

Jan. 31, 2019

Disclosure Text Block Supplement [Abstract]

Nonvested Restricted Stock Shares Activity [Table Text Block]

The following table summarizes non-vested restricted stock award activity for fiscal years 2018, 2017 and 2016:

	2018
	Non-Vested Shares		Weighted Average Grant Date Fair Value (000’s)		Weighted Average Remaining VestingTerm (in years)

Non-Vested at January 31, 2018		29,415	$	2,275		2
Granted		21,744		1,623
Forfeited		—		—
Vested		13,123		963

Non-Vested at January 31, 2019		38,036	$	2,935		2

	2017
	Non-Vested Shares		Weighted Average Grant Date Fair Value (000’s)		Weighted Average Remaining VestingTerm (in years)

Non-Vested at January 31, 2017		23,350	$	1,386		2
Granted		14,156		1,370
Forfeited		—		—
Vested		8,091		481

Non-Vested at January 31, 2018		29,415	$	2,275		2

	2016
	Non-Vested Shares		Weighted Average Grant Date Fair Value (000’s)		Weighted Remaining Vesting Vesting Term (in years)

Non-Vested at January 31, 2016		3,168	$	200		2
Granted		21,502		1,269
Forfeited		—		—
Vested		1,320		83

Non-Vested at January 31, 2017		23,350	$	1,386		2

Income Taxes (Tables)

12 Months Ended

Jan. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The (benefit) provision for income taxes for fiscal years 2018, 2017 and 2016 consist of the following (amounts in thousands):

	2018			2017			2016

Federal:
Current	$	81		$	(2,094	)	$	12,197
Deferred		(23,547	)		(19,528	)		3,568

		(23,466	)		(21,622	)		15,765

State and Local:
Current		361			1,180			2,153
Deferred		183			923			(525	)

		544			2,103			1,628

(Benefit) provision for income taxes	$	(22,922	)	$	(19,519	)	$	17,393

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The tax effects of significant temporary differences representing deferred tax assets and liabilities are as follows (amounts in thousands):

	January 31,
	2019			2018

Assets:
General business credit carryforward	$	26,523		$	3,897
Accrued liabilities		308			687
State net operating loss carryforward		294			241
Other items		647			576
Valuation allowance		(232	)		(241	)

Total		27,540			5,160
Liabilities:
Basis in pass through entities, including depreciation		(25,725	)		(26,717	)
Other		(157	)		(149	)

Total		(25,882	)		(26,866	)
Net deferred tax asset (liability)	$	1,658		$	(21,706	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The effective income tax rate on consolidated pre-tax income or loss differs from the federal income tax statutory rate for fiscal years 2018, 2017 and 2016 as follows:

	2018			2017			2016

Federal income tax at statutory rate		21.0	%		33.8	%		35.0	%
State and local taxes, net of federal tax benefit		3.6			3.2			2.3
Section 45 production tax credits		(145.2	)		(45.4	)		—
Research and experimentation credits		(77.8	)		—			—
Tax Cuts and Jobs Act		1.9			(56.6	)		—
Domestic production activities deduction		—			(5.9	)		(2.9	)
Uncertain tax positions		47.1			1.4			0.8
Noncontrolling interest		(9.9	)		(7.6	)		(4.6	)
Other		2.2			0.2			—

Total		(157.1	)%		(76.9	)%		30.6	%

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the beginning and ending amount of unrecognized tax benefits, including interest and penalties, is as follows (dollars in thousands):

	Fiscal Year
	2018		2017

Unrecognized tax benefits, beginning of year	$	2,325	$	2,096
Changes for tax positions for prior years		5,973		269
Changes for tax positions for current year		934		(40	)

Unrecognized tax benefits, end of year	$	9,232	$	2,325

Segment Reporting (Tables)

12 Months Ended

Jan. 31, 2019

Segment Reporting (Tables) [Line Items]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The following tables summarize segment and other results and assets (amounts in thousands):

	Fiscal Year
	2018			2017			2016

Net sales and revenue:

Ethanol and by-products	$	485,885		$	452,153		$	453,799
Refined coal ¹		786			433			—
Total net sales and revenue	$	486,671		$	452,586		$	453,799

Segment gross profit (loss):

Ethanol and by-products	$	43,856		$	51,509		$	71,039
Refined coal		(13,641	)		(7,348	)		—
Total gross profit	$	30,215		$	44,161		$	71,039

Income (loss) before income taxes:

Ethanol and by-products	$	31,545		$	38,352		$	59,447
Refined coal		(15,204	)		(10,021	)		—
Corporate and other		(1,753	)		(2,938	)		(2,536	)
Total income before income taxes	$	14,588		$	25,393		$	56,911

Benefit (provision) for income taxes:

Ethanol and by-products	$	(2,343	)	$	3,245		$	(18,259	)
Refined coal		24,674			15,168			—
Corporate and other		591			1,106			866
Total benefit (provision) for income taxes	$	22,922		$	19,519		$	(17,393	)

Segment profit (loss):

Ethanol and by-products	$	23,346		$	35,880		$	33,950
Refined coal		10,148			5,628			—
Corporate and other		(1,849	)		(1,802	)		(1,617	)
Net income attributable to REX common shareholders	$	31,645		$	39,706		$	32,333

	Fiscal Year
	2018		2017			2016

Sales of products, ethanol and by-products segment:

Ethanol	$	368,319	$	359,239		$	358,349
Dried distillers grains		85,417		63,120			71,204
Non-food grade corn oil		20,097		21,195			18,518
Modified distillers grains		11,950		8,525			5,326
Other		102		74			402
Total sales	$	485,885	$	452,153		$	453,799

Sales of products, refined coal segment:

Refined coal	$	786	$	433		$	—

Interest income:

Ethanol and by-products	$	2,460	$	878		$	212
Refined coal		—		—			—
Corporate and other		1,054		678			222
Total interest income	$	3,514	$	1,556		$	434

Depreciation expense:

Ethanol and by-products	$	22,004	$	20,037		$	19,464
Refined coal		2,784		1,385			—
Corporate and other		40		40			55
Total depreciation expense	$	24,828	$	21,462		$	19,519

Equity in income of unconsolidated affiliates:

Ethanol and by-products	$	1,536	$	3,232		$	6,144
Refined coal		—		—			—
Corporate and other		—		—			—
Total equity in income of unconsolidated affiliates	$	1,536	$	3,232		$	6,144

(Loss) gain on sale of investment:

Ethanol and by-products	$	—	$	(13	)	$	192
Refined coal		—		—			—
Corporate and other		—		—			—
Total gain on sale of investment	$	—	$	(13	)	$	192

¹Sales in the refined coal segment are recorded net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.

Assets [Member]

Segment Reporting (Tables) [Line Items]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	January 31,
Assets:	2019		2018

Ethanol and by-products	$	393,691	$	384,997
Refined coal		8,625		12,165
Corporate and other		69,077		81,702
Total assets	$	471,393	$	478,864

Additions to other long lived assets:

Ethanol and by-products	$	—	$	796
Refined coal		—		—
Corporate and other		—		—
Total additions to other long lived assets	$	—	$	796

Additions to property and equipment:

Ethanol and by-products	$	10,697	$	24,017
Refined coal		78		—
Corporate and other		—		—
Total additions to property and equipment	$	10,775	$	24,017

QUARTERLY UNAUDITED INFORMATION (Tables)

12 Months Ended

Jan. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

	Quarters Ended (In Thousands, Except Per Share Amounts)
	April 30,		July 31,		October 31,		January 31,
	2018		2018		2018		2019

Net sales and revenue	$	120,820	$	128,757	$	123,750	$	113,344
Gross profit		10,851		9,399		7,747		2,218
Net income		10,352		10,490		13,769		2,899
Net income attributable to REX common shareholders		9,496		9,217		11,875		1,057
Basic and diluted net income per share attributable to REX common shareholders	$	1.45	$	1.43	$	1.86	$	0.17

		Quarters Ended (In Thousands, Except Per Share Amounts)
		April 30,		July 31,		October 31,		January 31,
		2017		2017		2017		2018

Net sales and revenue	$	113,143	$	108,744	$	121,164	$	109,535
Gross profit		12,489		10,781		14,867		6,024
Net income		5,612		4,171		14,994		20,135
Net income attributable to REX common shareholders		4,544		2,941		13,168		19,053
Basic and diluted net income per share attributable to REX common shareholders (a)	$	0.69	$	0.45	$	2.00	$	2.89

The total of the quarterly net income per share amounts do not equal the annual net income per share amounts due to the impact of varying amounts of shares outstanding during the year.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Number Of Operating Entities	5
Number of Reportable Segments	2	2
Concentration Risk, Customer		Six
Property, Plant and Equipment, Depreciation Methods	Depreciation is computed using the straight-line method.
Depreciation	$ 24,828,000	$ 21,462,000	$ 19,519,000
Liabilities		121,000
Assets	$ 471,393,000	$ 478,864,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	33.80%	35.00%
Cost of Sales [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting	20.00%
Contracts Not Accounted For Under Normal Purchases and Normal Sales
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Liabilities	$ 21,000
Assets		$ 100,000
Minimum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Operating Lease, Right-of-Use Asset	$ 18,000,000
Minimum [Member] \| Building and Building Improvements [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	5
Minimum [Member] \| Fixtures And Equipment [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	2
Maximum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Operating Lease, Right-of-Use Asset	$ 22,000,000
Maximum [Member] \| Building and Building Improvements [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	40 years
Maximum [Member] \| Fixtures And Equipment [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	20 years
Customer Concentration Risk [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Customer	Six		five
Concentration Risk, Percentage	85.00%	87.00%	83.00%
Income Tax Examination, Penalties and Interest Accrued	$ 0.80	$ 0.89
Accounting Standards Update 2016-18 [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Increase in Restricted Cash	354,000	130,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect		224,000	$ 76,000
Refined Coal [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Assets	$ 8,625,000	$ 12,165,000
Refined Coal [Member] \| Majority-Owned Subsidiary, Unconsolidated [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Number of Reportable Segments	1
Consolidated Entities [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Number Of Operating Entities	4
Equity Method Investee [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Number Of Operating Entities	1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Schedule of components of Basis of Presentation - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Schedule of components of Basis of Presentation [Abstract]
Interest income	$ 3,514	$ 1,556	$ 434
(Loss) gain on sale of investment		(13)	192
(Loss) gain on disposal of real estate and property and equipment, net	(104)	(192)	328
Other	(22)	709	162
Total	$ 3,388	$ 2,060	$ 1,116

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Schedule of components of inventory - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Schedule of components of inventory [Abstract]
Ethanol and other finished goods	$ 5,767	$ 8,402
Work in process	3,094	2,824
Grain and other raw materials	9,616	9,529
Total	$ 18,477	$ 20,755

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Schedule of Property Plant and Equipment - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Schedule of Property Plant and Equipment [Abstract]
Land and improvements	$ 21,469	$ 21,074
Buildings and improvements	23,608	23,272
Machinery, equipment and fixtures	297,807	288,832
Construction in progress	708	3,155
	343,592	336,333
Less: accumulated depreciation	(161,071)	(138,506)
Total	$ 182,521	$ 197,827

INVESTMENTS (Details) $ in Thousands, gal in Millions	12 Months Ended
INVESTMENTS (Details) $ in Thousands, gal in Millions	Jan. 31, 2019 USD ($) gal	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)
INVESTMENTS (Details) [Line Items]
Income (Loss) from Equity Method Investments	$ 1,536	$ 3,232	$ 6,144
Proceeds from Equity Method Investment, Distribution	4,010	6,516	7,018
Equity Method Investments	$ 32,075	34,549
Debt Securities, Held-to-maturity, Maturity, within One Year, Weighted Average Yield	2.29%
Debt Securities, Held-to-maturity		0
Big River [Member]
INVESTMENTS (Details) [Line Items]
Payments to Acquire Equity Method Investments	$ 20,000
Quantity of ethanol shipped (in US Gallons) \| gal	428.6
Income (Loss) from Equity Method Investments	$ 1,500	3,200	6,100
Proceeds from Equity Method Investment, Distribution	4,000	$ 6,500	$ 7,000
Equity Method Investments	32,100
Equity Method Investment, Underlying Equity in Net Assets	28,300
Other Restricted Assets	185,100
Proportionate Share of Restricted Net Assets	$ 19,100

INVESTMENTS (Details) - Schedule of Equity Method Investments - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Schedule of Equity Method Investments [Abstract]
Carrying amount	$ 32,075	$ 34,549
Ownership percentage	10.30%	10.30%

INVESTMENTS (Details) - Schedule of Condensed Balance Sheet - Big River [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]
Current assets	$ 117,796	$ 149,436
Non current assets	241,382	261,443
Total assets	359,178	410,879
Current liabilities	50,172	49,130
Long-term liabilities	701	10,599
Total liabilities	50,873	59,729
Noncontrolling interests	$ 34,149	$ 38,412

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(11))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(15))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(16))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(10))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

INVESTMENTS (Details) - Schedule of Financial information For Equity Method Investment - Big River [Member] - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
INVESTMENTS (Details) - Schedule of Financial information For Equity Method Investment [Line Items]
Net sales and revenue	$ 802,523	$ 817,112	$ 851,434
Gross profit	33,782	60,259	88,841
Income from continuing operations	14,893	32,243	63,292
Net income	$ 14,893	$ 32,243	$ 63,292

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

INVESTMENTS (Details) - Schedule of held-to-maturity security $ in Thousands	12 Months Ended
	Jan. 31, 2019 USD ($)
Schedule of held-to-maturity security [Abstract]
United States Treasury Bill, Amortized Cost	$ 14,975
United States Treasury Bill, Gross Unrealized Losses	2
United States Treasury Bill, Estimated Fair Value	$ 14,973

BUSINESS COMBINATIONS (Details) - Refined Coal [Member] - USD ($)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Aug. 10, 2017
BUSINESS COMBINATIONS (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			95.35%
Net Sales and Revenue of Business Segment	$ 1,200,000
Net Income (Loss) Attributable to Parent	15,800,000
Business Acquisition, Pro Forma Revenue		$ 452,600,000
Business Acquisition, Pro Forma Net Income (Loss)		38,900,000
Payments to Acquire Businesses, Gross	$ 12,049,000
Business Acquisition, Transaction Costs		$ 2,500,000

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

BUSINESS COMBINATIONS (Details) - Schedule of Estimated Fair Values of Assets Acquired at Acquisition Date $ in Thousands	12 Months Ended
	Jan. 31, 2019 USD ($)
Schedule of Estimated Fair Values of Assets Acquired at Acquisition Date [Abstract]
Inventory	$ 49
Property, plant and equipment	12,000
Total assets acquired and purchase price	$ 12,049

FAIR VALUE (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis - USD ($)
$ in Thousands

Jan. 31, 2019

Jan. 31, 2018

FAIR VALUE (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Commodity futures

$ 44

^[1]

$ 87

^[2]

Investment in cooperative

^[3]

333

Total assets

377

405

Forward purchase contracts liability

^[2]

^[4]

Total liabilities

121

Forward purchase contracts asset

^[5]

Fair Value, Inputs, Level 1 [Member]

FAIR VALUE (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Commodity futures

^[1]

^[2]

Investment in cooperative

^[3]

Forward purchase contracts liability

^[2]

^[4]

Forward purchase contracts asset

^[5]

Fair Value, Inputs, Level 2 [Member]

FAIR VALUE (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Commodity futures

^[1]

^[2]

Investment in cooperative

^[3]

Total assets

Forward purchase contracts liability

^[2]

^[4]

Total liabilities

121

Forward purchase contracts asset

^[5]

Fair Value, Inputs, Level 3 [Member]

FAIR VALUE (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

Commodity futures

^[1]

^[2]

Investment in cooperative

^[3]

333

Total assets

333

Forward purchase contracts liability

^[2]

^[4]

Forward purchase contracts asset

^[5]

[1]	The commodity futures asset is included in "Prepaid expenses and other" on the accompanying Consolidated Balance Sheets.
[2]	The commodity futures liability is included in "Accrued expenses and other current liabilities" on the accompanying Consolidated Balance Sheets.
[3]	The investment in cooperative is included in "Other assets" on the accompanying Consolidated Balance Sheets.
[4]	The forward purchase contract liability is included in "Accrued expenses and other current liabilities" on the accompanying Consolidated Balance Sheets.
[5]	The forward purchase contract asset is included in "Prepaid expenses and other" on the accompanying Consolidated Balance Sheets.

OTHER ASSETS (Details) - Schedule of Other Assets - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Schedule of Other Assets [Abstract]
Deferred taxes	$ 5,843
Real estate taxes refundable		$ 6,719
Other	333	735
Total	$ 6,176	$ 7,454

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - Schedule of accrued expenses and other current liabilities - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Schedule of accrued expenses and other current liabilities [Abstract]
Accrued payroll and related items	$ 2,041	$ 5,108
Accrued utility charges	2,924	2,639
Accrued transportation related items	1,567	1,561
Accrued real estate taxes	1,680	2,678
Accrued income taxes	71	61
Other	1,263	1,669
Total	$ 9,546	$ 13,716

LEASES (Details) - Schedule of Future Minimum Rental Payments for Operating Leases $ in Thousands	Jan. 31, 2019 USD ($)
Schedule of Future Minimum Rental Payments for Operating Leases [Abstract]
2019	$ 6,767
2020	5,487
2021	4,791
2022	3,208
2023	2,041
Thereafter	1,221
	$ 23,515

COMMON STOCK (Details) - USD ($)	12 Months Ended
COMMON STOCK (Details) - USD ($)	Jan. 31, 2019	Jan. 31, 2017
COMMON STOCK (Details) [Line Items]
Treasury Stock, Shares, Acquired	305,473	87,904
Treasury Stock, Value, Acquired, Cost Method (in Dollars)	$ 21,855,000	$ 4,353,000
Stock Repurchase Program Number of Additional Shares Authorized to be Repurchased	349,861
Apporximation
COMMON STOCK (Details) [Line Items]
Treasury Stock, Value, Acquired, Cost Method (in Dollars)	$ 21,856,000	$ 4,353,000

COMMON STOCK (Details) - Schedule of Common Stock - shares shares in Thousands	Jan. 31, 2019	Jan. 31, 2018
Schedule of Common Stock [Abstract]
Authorized shares	45,000	45,000
Issued shares	29,853	29,853
Outstanding shares	6,274	6,566

REVOLVING LINES OF CREDIT (Details) $ in Millions	12 Months Ended
REVOLVING LINES OF CREDIT (Details) $ in Millions	Jan. 31, 2019 USD ($)
Debt Disclosure [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10.0
Debt Instrument, Maturity Date	Jun. 01, 2019
Line of Credit Facility, Interest Rate Description	LIBOR rate plus 225 basis points

DERIVATIVE FINANCIAL INSTRUMENTS (Details) l in Millions, bu in Millions	12 Months Ended
	Jan. 31, 2019 USD ($) bu	Jan. 31, 2018 USD ($) bu l	Jan. 31, 2017 USD ($)
DERIVATIVE FINANCIAL INSTRUMENTS (Details) [Line Items]
Debt Instrument, Collateral Amount \| $	$ 281,000
Derivative, Gain on Derivative \| $	$ 2,698,000	$ 1,317,000	$ 2,131,000
Corn [Member]
DERIVATIVE FINANCIAL INSTRUMENTS (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels) \| bu	1.3	11.7
Corn [Member] \| Short/Sell [Member]
DERIVATIVE FINANCIAL INSTRUMENTS (Details) [Line Items]
Commodity Futures, Quantity	2.0	2.5
Ethanol [Member] \| Short/Sell [Member]
DERIVATIVE FINANCIAL INSTRUMENTS (Details) [Line Items]
Commodity Futures, Quantity \| l		2.8
Ethanol [Member] \| Long/Buy [Member]
DERIVATIVE FINANCIAL INSTRUMENTS (Details) [Line Items]
Commodity Futures, Quantity \| l		2.8

DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Values for Derivative Financial Instruments - USD ($)
$ in Thousands

Jan. 31, 2019

Jan. 31, 2018

Commodity Contract [Member]

DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Values for Derivative Financial Instruments [Line Items]

Asset Derivatives, Fair Value

^[1]

$ 44

Liability Derivatives, Fair Value

^[1]

Forward Contracts [Member]

DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Values for Derivative Financial Instruments [Line Items]

Asset Derivatives, Fair Value

^[2]

Liability Derivatives, Fair Value

^[2]

$ 22

$ 34

[1]

[2]

EMPLOYEE BENEFITS (Details) - USD ($)	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
EMPLOYEE BENEFITS (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	$ 200,000	$ 233,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	38,036,000	29,415,000	23,350,000	3,168,000
Rex Shareholders [Member]
EMPLOYEE BENEFITS (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	34,148	24,711	18,541
Stock Option Plans 2015 [Member] \| Employee Stock Option [Member]
EMPLOYEE BENEFITS (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	550,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	489,430

EMPLOYEE BENEFITS (Details) - Schedule of Non-Vested Restricted Stock Award Activity - USD ($) shares in Thousands, $ / shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Schedule of Non-Vested Restricted Stock Award Activity [Abstract]
Non-Vested Shares, Beginning of Period	29,415	23,350	3,168
Weighted Average Grant Date Fair Value, Beginning of Period (in Dollars)	$ 2,275	$ 1,386	$ 200
Weighted Average Vesting Term, Beginning of Period	2 years	2 years	2 years
Non-Vested Shares, Granted	21,744	14,156	21,502
Weighted Average Grant Date Fair Value, Granted (in Dollars per share)	$ 1,623	$ 1,370	$ 1,269
Non-Vested Shares, Vested	13,123	8,091	1,320
Weighted Average Grant Date Fair Value, Vested (in Dollars)	$ 963	$ 481	$ 83
Non-Vested Shares, End of Period	38,036	29,415	23,350
Weighted Average Grant Date Fair Value, End of Period (in Dollars)	$ 2,935	$ 2,275	$ 1,386
Weighted Average Vesting Term, End of Period	2 years	2 years	2 years

Commitments (Details) lb in Millions, gal in Millions, bu in Millions	12 Months Ended
	Jan. 31, 2019 USD ($) T lb gal bu	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)
One Earth Energy And Nu Gen Energy [Member]
Commitments (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels) \| bu	13.0
Quantity of Ethanol under Sales Commitment (in US Gallons) \| gal	32.3
Quantity of Distillers Grains Under Sales Commitment (in US Tons) \| T	88,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) \| lb	18.2
Supply Commitment Expected Period Of Delivery	They expect to deliver the ethanol, distillers grains and corn oil through March 2019.
One Earth Energy And Nu Gen Energy [Member] \| Railcars One [Member]
Commitments (Details) [Line Items]
Operating Leases, Rent Expense, Net	$ 8,109,000	$ 8,600,000	$ 8,515,000
One Earth Energy And Nu Gen Energy [Member] \| Distillers Grains Marketing Services [Member]
Commitments (Details) [Line Items]
Marketing Expense	$ 1,250,000	1,354,000	1,194,000
One Earth Energy [Member] \| Natural Gas Pipeline [Member]
Commitments (Details) [Line Items]
Lease Expiration Period	10 years
Operating Leases, Future Minimum Payments Due	$ 4,380,000
Number of installments payable	120
Installment amount	$ 36,500
Operating Leases, Rent Expense, Net	$ 438,000	438,000	$ 438,000
One Earth Energy [Member] \| Renewal [Member] \| Natural Gas Pipeline [Member]
Commitments (Details) [Line Items]
Lease Expiration Period	15 years
Installment amount	$ 29,250
Alliance Grain [Member]
Commitments (Details) [Line Items]
Percentage of Grain Purchase Under Agreement	100.00%
Expiration Date of Grain Agreement	Dec. 31, 2020
Maximum Period to Notify Other Party for Grain Agreement Period Extension	180 days
Refined Coal [Member]
Commitments (Details) [Line Items]
Fees Incurred By Subsidiary	$ 9,900,000	$ 5,500,000

Income Taxes (Details) - USD ($)	12 Months Ended
Income Taxes (Details) - USD ($)	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards	$ 26,523,000	$ 3,897,000
Deferred Tax Assets, Valuation Allowance	$ 232,000	$ 241,000	$ 417,000	$ 1,151,000
Valuation Allowance, Methodologies and Assumptions	$9,000	$176,000	$734,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	33.80%	35.00%
Deferred Other Tax Expense (Benefit)	$ (14,362,000)
Tax Adjustments, Settlements, and Unusual Provisions	272,000
Tax Credit Carryforward, Amount	21,200,000	$ 11,500,000
Deferred Federal, State and Local, Tax Expense (Benefit)	4,600,000
Income Taxes Paid	855,000	6,920,000	$ 7,090,000
Proceeds from Income Tax Refunds	1,132,000	476,000	150,000
Unrecognized Tax Benefits	8,785,000	$ 2,325,000	$ 2,096,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	447,000
Increase (Decrease) in Provision For Income Taxes	$ (8,304,000)

Income Taxes (Details) - Schedule of Unrecognized Tax Benefits Roll Forward - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Federal:
Current	$ 81	$ (2,094)	$ 12,197
Deferred	(23,547)	(19,528)	3,568
	(23,466)	(21,622)	15,765
State and Local:
Current	361	1,180	2,153
Deferred	183	923	(525)
	544	2,103	1,628
(Benefit) provision for income taxes	$ (22,922)	$ (19,519)	$ 17,393

Income Taxes (Details) - Schedule of Deferred Tax Assets and Liabilities - USD ($)	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Assets:
General business credit carryforward	$ 26,523,000	$ 3,897,000
Accrued liabilities	308,000	687,000
State net operating loss carryforward	294,000	241,000
Other items	647,000	576,000
Valuation allowance	(232,000)	(241,000)	$ (417,000)	$ (1,151,000)
Total	27,540,000	5,160,000
Liabilities:
Basis in pass through entities, including depreciation	(25,725,000)	(26,717,000)
Other	(157,000)	(149,000)
Total	(25,882,000)	(26,866,000)
Net deferred tax asset (liability)	$ 1,658,000	$ (21,706,000)

Income Taxes (Details) - Schedule of Effective Income Tax Reconciliation	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Schedule of Effective Income Tax Reconciliation [Abstract]
Federal income tax at statutory rate	21.00%	33.80%	35.00%
State and local taxes, net of federal tax benefit	3.60%	3.20%	2.30%
Section 45 production tax credits	(145.20%)	(45.40%)
Research and experimentation credits	(77.80%)
Tax Cuts and Jobs Act	1.90%	(56.60%)
Domestic production activities deduction		(5.90%)	(2.90%)
Uncertain tax positions	47.10%	1.40%	0.80%
Noncontrolling interest	(9.90%)	(7.60%)	(4.60%)
Other	2.20%	0.20%
Total	(157.10%)	(76.90%)	30.60%

Income Taxes (Details) - Schedule of Unrecognized Tax Benefits Roll Forward - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Schedule of Unrecognized Tax Benefits Roll Forward [Abstract]
Unrecognized tax benefits, beginning of year	$ 2,325	$ 2,096
Changes for tax positions for prior years	5,973	269
Changes for tax positions for current year	934	(40)
Unrecognized tax benefits, end of year	$ 9,232	$ 2,325

Segment Reporting (Details)	12 Months Ended
Segment Reporting (Details)	Jan. 31, 2019	Jan. 31, 2018
Segment Reporting [Abstract]
Number of Reportable Segments	2	2

Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Jan. 31, 2019

Oct. 31, 2018

Jul. 31, 2018

Apr. 30, 2018

Jan. 31, 2018

Oct. 31, 2017

Jul. 31, 2017

Apr. 30, 2017

Jan. 31, 2019

Jan. 31, 2018

Jan. 31, 2017

Segment Reporting Information [Line Items]

Net sales and revenue:

$ 113,344

$ 123,750

$ 128,757

$ 120,820

$ 109,535

$ 121,164

$ 108,744

$ 113,143

$ 486,671

$ 452,586

$ 453,799

Segment gross profit (loss):

$ 2,218

$ 7,747

$ 9,399

$ 10,851

$ 6,024

$ 14,867

$ 10,781

$ 12,489

30,215

44,161

71,039

Income (loss) before income taxes:

14,588

25,393

56,911

Benefit (provision) for income taxes:

22,922

19,519

(17,393)

Segment profit (loss):

31,645

39,706

32,333

Sales of products, ethanol and by-products segment:

485,885

452,153

453,799

Interest income:

3,514

1,556

434

Depreciation expense:

24,828

21,462

19,519

Equity in income of unconsolidated affiliates:

1,536

3,232

6,144

(Loss) gain on sale of investment:

(13)

192

Ethanol [Member]

Segment Reporting Information [Line Items]

Net sales and revenue:

485,885

452,153

453,799

Segment gross profit (loss):

43,856

51,509

71,039

Income (loss) before income taxes:

31,545

38,352

59,447

Benefit (provision) for income taxes:

(2,343)

3,245

(18,259)

Segment profit (loss):

23,346

35,880

33,950

Sales of products, ethanol and by-products segment:

368,319

359,239

358,349

Interest income:

2,460

878

212

Depreciation expense:

22,004

20,037

19,464

Equity in income of unconsolidated affiliates:

1,536

3,232

6,144

(Loss) gain on sale of investment:

(13)

192

Refined Coal [Member]

Segment Reporting Information [Line Items]

Net sales and revenue:

^[1]

786

433

Segment gross profit (loss):

(13,641)

(7,348)

Income (loss) before income taxes:

(15,204)

(10,021)

Benefit (provision) for income taxes:

24,674

15,168

Segment profit (loss):

10,148

5,628

Sales of products, refined coal segment:

786

433

Depreciation expense:

2,784

1,385

Corporate and Other [Member]

Segment Reporting Information [Line Items]

Income (loss) before income taxes:

(1,753)

(2,938)

(2,536)

Benefit (provision) for income taxes:

591

1,106

866

Segment profit (loss):

(1,849)

(1,802)

(1,617)

Interest income:

1,054

678

222

Depreciation expense:

Dried Distillers Grains [Member]

Segment Reporting Information [Line Items]

Sales of products, ethanol and by-products segment:

85,417

63,120

71,204

Non-Food Grade Corn Oil [Member]

Segment Reporting Information [Line Items]

Sales of products, ethanol and by-products segment:

20,097

21,195

18,518

Modified Distillers Grains [Member]

Segment Reporting Information [Line Items]

Sales of products, ethanol and by-products segment:

11,950

8,525

5,326

Other Segments [Member]

Segment Reporting Information [Line Items]

Sales of products, ethanol and by-products segment:

$ 102

$ 74

$ 402

[1]	Sales in the refined coal segment are recorded net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.

Segment Reporting (Details) - Schedule Of Segment Assets - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 471,393	$ 478,864
Additions to other long lived assets:
Additions to other long lived assets:		796
Additions to property and equipment:
Additions to property and equipment:	10,775	24,017
Ethanol [Member]
Segment Reporting Information [Line Items]
Assets	393,691	384,997
Additions to other long lived assets:
Additions to other long lived assets:		796
Additions to property and equipment:
Additions to property and equipment:	10,697	24,017
Refined Coal [Member]
Segment Reporting Information [Line Items]
Assets	8,625	12,165
Additions to property and equipment:
Additions to property and equipment:	78
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 69,077	$ 81,702

QUARTERLY UNAUDITED INFORMATION (Details) - Schedule of Quarterly Financial Information - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Schedule of Quarterly Financial Information [Abstract]
Net sales and revenue	$ 113,344	$ 123,750	$ 128,757	$ 120,820	$ 109,535	$ 121,164	$ 108,744	$ 113,143	$ 486,671	$ 452,586	$ 453,799
Gross profit	2,218	7,747	9,399	10,851	6,024	14,867	10,781	12,489	30,215	44,161	71,039
Net income	2,899	13,769	10,490	10,352	20,135	14,994	4,171	5,612	37,510	44,912	39,518
Net income attributable to REX common shareholders	$ 1,057	$ 11,875	$ 9,217	$ 9,496	$ 19,053	$ 13,168	$ 2,941	$ 4,544	$ 31,645	$ 39,706	$ 32,333
Basic and diluted net income per share attributable to REX common shareholders (in Dollars per share)	$ 170	$ 1,860	$ 1,430	$ 1,450	$ 2,890	$ 2,000	$ 450	$ 690	$ 4.91	$ 6.02	$ 4.91

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

RELATED PARTIES (Details) - USD ($) $ in Thousands	12 Months Ended
RELATED PARTIES (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
RELATED PARTIES (Details) [Line Items]
Accounts Payable, Related Parties, Current	$ 1,900	$ 900
Proceeds from Contributions from Affiliates	524	918
Refined Coal [Member]
RELATED PARTIES (Details) [Line Items]
Costs and Expenses, Related Party	800
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party		1,800
Accrued Liabilities for Commissions, Expense and Taxes	1,600	1,500
Proceeds from Contributions from Affiliates	500	900
One Earth Energy And Nu Gen Energy [Member]
RELATED PARTIES (Details) [Line Items]
Costs and Expenses, Related Party	$ 176,800	$ 154,500	$ 148,500

Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - VALUATION AND QUALIFYING ACCOUNTS - USD ($)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
2019:
Balance	$ 241,000	$ 417,000	$ 1,151,000
Deductions Charges for Which Reserves Were Created	9,000	176,000	734,000
Balance	$ 232,000	$ 241,000	$ 417,000