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Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Jan. 31, 2017	Mar. 24, 2017	Jul. 31, 2016
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		6,558,679
Entity Public Float			$ 368,483,290
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, 2017
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 188,576	$ 135,765
Restricted cash	130	54
Accounts receivable	11,901	13,666
Inventory	17,057	17,178
Refundable income taxes	1,070	5,254
Prepaid expenses and other	6,959	6,407
Deferred taxes - net	824	1,036
Total current assets	226,517	179,360
Property and equipment - net	182,761	189,976
Other assets	6,913	6,642
Equity method investments	37,833	38,707
TOTAL ASSETS	454,024	414,685
CURRENT LIABILITIES:
Accounts payable – trade	9,171	10,212
Accrued expenses and other current liabilities	13,348	9,423
Total current liabilities	22,519	19,635
LONG TERM LIABILITIES:
Deferred taxes	41,135	38,304
Other long term liabilities	2,096	987
Total long term liabilities	43,231	39,291
EQUITY:
Common stock, 45,000 shares authorized, 29,853 shares issued at par	299	299
Paid in capital	145,767	144,844
Retained earnings	508,207	475,874
Treasury stock, 23,292 and 23,204 shares, respectively	(313,838)	(309,754)
Total REX shareholders’ equity	340,435	311,263
Noncontrolling interests	47,839	44,496
Total equity	388,274	355,759
TOTAL LIABILITIES AND EQUITY	$ 454,024	$ 414,685

CONSOLIDATED BALANCE SHEETS (Parentheticals) - shares shares in Thousands	Jan. 31, 2017	Jan. 31, 2016
Common stock, shares authorized	45,000	45,000
Common stock, shares issued	29,853	29,853
Treasury stock, shares	23,292	23,204

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Net sales and revenue	$ 453,799	$ 436,488	$ 572,230
Cost of sales	382,760	385,654	430,291
Gross profit	71,039	50,834	141,939
Selling, general and administrative expenses	(21,388)	(19,813)	(19,422)
Equity in income of unconsolidated ethanol affiliates	6,144	8,984	32,229
Gain on sale of investment	192	10,385
Interest and other income	596	625	368
Interest expense			(2,074)
Gain (loss) on disposal of real estate and property and equipment, net	328	503	(238)
Income from continuing operations before income taxes	56,911	51,518	152,802
Provision for income taxes	(17,393)	(14,108)	(49,649)
Income from continuing operations	39,518	37,410	103,153
Income from discontinued operations, net of tax			234
Gain on disposal of discontinued operations, net of tax			327
Net income	39,518	37,410	103,714
Net income attributable to noncontrolling interests	(7,185)	(5,974)	(16,377)
Net income attributable to REX common shareholders	$ 32,333	$ 31,436	$ 87,337
Weighted average shares outstanding – basic (in Shares)	6,587	7,297	8,109
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 4.91	$ 4.31	$ 10.70
Basic income per share from discontinued operations attributable to REX common shareholders (in Dollars per share)			0.03
Basic income per share on disposal of discontinued operations attributable to REX common shareholders (in Dollars per share)			0.04
Basic net income per share attributable to REX common shareholders (in Dollars per share)	$ 4.91	$ 4.31	$ 10.77
Weighted average shares outstanding – diluted (in Shares)	6,587	7,307	8,118
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 4.91	$ 4.30	$ 10.69
Diluted income per share from discontinued operations attributable to REX common shareholders (in Dollars per share)			0.03
Diluted income per share on disposal of discontinued operations attributable to REX common shareholders (in Dollars per share)			0.04
Diluted net income per share attributable to REX common shareholders (in Dollars per share)	$ 4.91	$ 4.30	$ 10.76
Amounts attributable to REX common shareholders:
Income from continuing operations, net of tax	$ 32,333	$ 31,436	$ 86,776
Income from discontinued operations, net of tax			561
Net income	$ 32,333	$ 31,436	$ 87,337

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Balance at Jan. 31, 2014	$ 299,000	$ (222,170,000)	$ 144,051,000	$ 357,101,000	$ 31,472,000	$ 310,753,000
Balance (in Shares) at Jan. 31, 2014	29,853,000	21,753,000
Net income				87,337,000	16,377,000	103,714,000
Treasury stock acquired		$ (18,238,000)				$ (18,238,000)
Treasury stock acquired (in Shares)		284,000				283,979
Noncontrolling interests distribution and other					(4,856,000)	$ (4,856,000)
Stock options and related tax effects		$ 851,000	740,000			1,591,000
Stock options and related tax effects (in Shares)		(83,000)
Balance at Jan. 31, 2015	$ 299,000	$ (239,557,000)	144,791,000	444,438,000	42,993,000	392,964,000
Balance (in Shares) at Jan. 31, 2015	29,853,000	21,954,000
Net income				31,436,000	5,974,000	37,410,000
Treasury stock acquired		$ (70,208,000)				$ (70,208,000)
Treasury stock acquired (in Shares)		1,254,000				1,254,344
Noncontrolling interests distribution and other					(4,471,000)	$ (4,471,000)
Stock options and related tax effects		$ 11,000	53,000			64,000
Stock options and related tax effects (in Shares)		(4,000)
Balance at Jan. 31, 2016	$ 299,000	$ (309,754,000)	144,844,000	475,874,000	44,496,000	355,759,000
Balance (in Shares) at Jan. 31, 2016	29,853,000	23,204,000
Net income				32,333,000	7,185,000	39,518,000
Treasury stock acquired		$ (4,353,000)				$ (4,353,000)
Treasury stock acquired (in Shares)		88,000				87,904
Noncontrolling interests distribution and other					(3,842,000)	$ (3,842,000)
Stock options and related tax effects		$ 269,000	923,000			1,192,000
Balance at Jan. 31, 2017	$ 299,000	$ (313,838,000)	$ 145,767,000	$ 508,207,000	$ 47,839,000	$ 388,274,000
Balance (in Shares) at Jan. 31, 2017	29,853,000	23,292,000

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 39,518,000	$ 37,410,000	$ 103,714,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,519,000	18,639,000	16,787,000
Impairment charges on real estate		125,000	68,000
Stock based compensation expense	1,314,000	64,000
Income from equity method investments	(6,144,000)	(8,984,000)	(32,229,000)
Dividends received from equity method investments	7,018,000	11,151,000	22,889,000
Gain on sale of investment	(192,000)	(10,385,000)
Derivative financial instruments			(1,141,000)
Gain on disposal of real estate and property and equipment	(328,000)	(503,000)	(275,000)
Deferred income tax	3,043,000	(4,196,000)	22,473,000
Excess tax benefit from stock option exercises			(441,000)
Changes in assets and liabilities:
Accounts receivable	(2,535,000)	(496,000)	7,692,000
Inventory	121,000	884,000	1,308,000
Prepaid expenses and other assets	(1,357,000)	(1,135,000)	(1,929,000)
Income taxes refundable	4,184,000	(2,235,000)	(1,985,000)
Accounts payable-trade	36,000	387,000	2,030,000
Accrued expenses and other liabilities	4,912,000	(536,000)	(1,745,000)
Net cash provided by operating activities	69,109,000	40,190,000	137,216,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(14,208,000)	(15,495,000)	(9,927,000)
Repayment of note receivable	24,000	23,000	6,000
Proceeds from sale of investment	4,492,000	45,476,000
Proceeds from sale of real estate and property and equipment	1,511,000	2,001,000	1,778,000
Restricted cash	(76,000)	(54,000)	500,000
Restricted investments and deposits	510,000	250,000	323,000
Net cash (used in) provided by investing activities	(7,747,000)	32,201,000	(7,320,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of long term debt			(75,726,000)
Stock options exercised			931,000
Payments to noncontrolling interests holders	(3,842,000)	(4,471,000)	(4,856,000)
Excess tax benefit from stock option exercises			441,000
Treasury stock acquired	(4,709,000)	(69,852,000)	(18,138,000)
Net cash used in financing activities	(8,551,000)	(74,323,000)	(97,348,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	52,811,000	(1,932,000)	32,548,000
CASH AND CASH EQUIVALENTS-Beginning of year	135,765,000	137,697,000	105,149,000
CASH AND CASH EQUIVALENTS-End of year	188,576,000	135,765,000	137,697,000
Non cash financing activities-Cashless exercises of stock options			100,000
Non cash financing activities-Accrued common stock repurchase		356,000
Non cash financing activities-Equity awards issued	1,095,000
Non cash investing activities-Accrued capital expenditures	$ 342,000	$ 1,063,000	804,000
Non cash investing activities- Loan receivable granted in connection with sale of real estate			$ 475,000

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Jan. 31, 2017

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, 2017, the Company owns interests in three ethanol entities – two are consolidated and one is accounted for using the equity method of accounting.

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 2016” means the period February 1, 2016 to January 31, 2017. The Company refers to its fiscal year by reference to the year immediately preceding the January 31 fiscal year end date.

Segments – The Company has one reportable segment, alternative energy. In applying the criteria set forth in ASC 280 “Segment Reporting”, 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.

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. Five (fiscal year 2016) and four (fiscal years 2015 and 2014) customers accounted for approximately 83%, 75% and 74% of the Company’s net sales and revenue during fiscal years 2016, 2015 and 2014, respectively. At January 31, 2017 and 2016, these customers represented approximately 88% and 47%, 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 co-products. 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 2016, 2015 or 2014. 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 at January 31, 2017, and January 31, 2016 are as follows (amounts in thousands):

	January 31,
	2017		2016

Ethanol and other finished goods	$	5,262	$	3,105
Work in process		2,359		2,652
Grain and other raw materials		9,436		11,421

Total	$	17,057	$	17,178

Property and Equipment – Property and equipment is recorded at cost. Depreciation is computed using the straight-line method. Estimated useful lives are 15 to 40 years for buildings and improvements, and 2 to 20 years for fixtures and equipment. The components of property and equipment at January 31, 2017 and 2016 are as follows (amounts in thousands):

	January 31,
	2017			2016

Land and improvements	$	20,951		$	21,598
Buildings and improvements		23,203			24,543
Machinery, equipment and fixtures		255,348			237,735
Construction in progress		1,046			6,094

		300,548			289,970
Less: accumulated depreciation		(117,787	)		(99,994	)

Total	$	182,761		$	189,976

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, based on an analysis of undiscounted future expected cash flows from the use and ultimate disposition of the asset. The Company recorded no impairment charges in fiscal year 2016. The Company recorded impairment charges of $125,000 in fiscal year 2015, all of which is included in cost of sales in the Consolidated Statement of Operations. The Company recorded impairment charges of $68,000 in fiscal year 2014, all of which is included in discontinued operations in the Consolidated Statement of Operations. These impairment charges are primarily related to unfavorable changes in real estate conditions in local markets. Impairment charges result from the Company’s management performing cash flow analysis and represent management’s estimate of the excess of net book value over fair value.

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 of an asset group 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 generally determines the fair value of the asset group using a discounted cash flow model based on market participant assumptions (for income producing asset groups) or by obtaining appraisals based on the market approach and comparable market transactions (for non-income producing asset groups).

Depreciation expense was approximately $19,519,000, $18,638,000 and $16,387,000 in fiscal years 2016, 2015 and 2014, respectively.

Investments and Deposits – 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 consolidates the results of two majority owned subsidiaries, One Earth and NuGen. 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. NuGen has the same fiscal year as the parent, and therefore, there is no lag in reporting the results of NuGen. 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 “Investments-Equity Method and Joint Ventures” 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. Any unallocated excess is treated as goodwill and is recorded as a component of the carrying value of the equity method investee. 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 investments in Big River and Patriot (through May 31, 2015 – see Note 2 for a discussion of the sale of the Company’s equity interest in Patriot) using the equity method of accounting and includes the results of these entities on a delayed basis of one month as they have 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.

Revenue Recognition – The Company recognizes sales from the production of ethanol, distillers grains and non-food grade corn oil when title transfers to customers, generally upon shipment from the ethanol plant or upon loading of the rail car used to transport the products.

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 and certain payroll in selling, general and administrative expenses.

Interest Expense – There was no cash paid for interest in fiscal years 2016 and 2015. Cash paid for interest in fiscal year 2014 was approximately $2,136,000.

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, 2017 and 2016 there were no material settlements of forward contracts that are recorded at fair value. At January 31, 2017, the company recorded an asset and a liability of $0.2 million and $0.1 million, respectively, associated with contracts not accounted for under the “normal purchases and normal sales” scope exemption of ASC 815. At January 31, 2016, the Company recorded a liability of $0.3 million associated with these 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.

The Company used derivative financial instruments to manage its balance of fixed and variable rate debt. Interest rate swap agreements involve the exchange of fixed and variable rate interest payments and do not represent an actual exchange of the notional amounts between the parties. The swap agreement was not designated for hedge accounting pursuant to ASC 815. The interest rate swap was recorded at its fair value and the changes in fair values were recorded as gain or loss on derivative financial instruments in the Consolidated Statements of Operations. The Company paid settlements of interest rate swaps of approximately $1,142,000 in fiscal years 2014.

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 11 for a further discussion of restricted stock.

The Company had stock-based compensation plans under which stock options had been granted to directors, officers and key employees. These plans were terminated in fiscal year 2015. The total intrinsic value of options (granted pursuant to these terminated plans) exercised in the year ended January 31, 2015 was approximately $4.0 million resulting in tax deductions to realize benefits of approximately $0.8 million.

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.

Discontinued Operations – Prior to the prospective adoption of ASU 2014-08, the Company classified sold real estate assets in discontinued operations when the operations and cash flows of the real estate assets had been eliminated from ongoing operations and when the Company did not have any significant continuing involvement in the operation of the real estate after disposal. Beginning February 1, 2015, only disposals of a component that represent a strategic shift that has (or will have) a major effect on operations and financial results are to be classified as discontinued operations.

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

New Accounting Pronouncements –The Company will be required to adopt 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. The updated standard permits the use of either the retrospective or cumulative effect transition method. The Financial Accounting Standards Board (“FASB”) has deferred the required adoption of the amended guidance by one year, from February 1, 2017 to February 1, 2018. Early application beginning February 1, 2017 is permitted. The Company has not completed its analysis of adopting this guidance but it does not expect the adoption of this guidance to have a material impact on its consolidated financial statements and related disclosures.

Effective February 1, 2018, the Company will be required to adopt Accounting Standards Update (“ASU”) No. 2015-17, “Balance Sheet Classification of Deferred Taxes”. This amended guidance requires that deferred income tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The Company has not yet determined the effect of this amended guidance on its consolidated financial statements and related disclosures.

In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of financial Assets and financial Liabilities”. This standard provides guidance for the recognition, measurement, presentation and disclosure of financial instruments. This standard is effective for annual and interim periods beginning after December 15, 2016. The Company has not completed its analysis of adopting this standard on its consolidated financial statements and related disclosures; however, the Company does not expect adoption of this standard to have a material effect on its consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU 2016-02, “Leases”. 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 will be required to adopt this standard effective February 1, 2019. The Company has not yet determined the effect of this amended guidance on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting”. This standard simplifies the accounting treatment for excess tax benefits and deficiencies, forfeitures, and cash flow considerations related to share-based compensation. This standard is effective for annual and interim periods beginning after December 15, 2016. The Company has not yet determined the effect of this standard on its consolidated financial statements and related disclosures.

In August 2016, the FASB issued 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 Company will be required to adopt this standard effective February 1, 2018. The Company has not determined the effect of this standard on its consolidated financial statements and related disclosures.

In November 2016, the FASB issued 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 will be required to adopt this standard effective February 1, 2018. The Company has not determined the effect of this standard on its consolidated financial statements and related disclosures.

INVESTMENTS

12 Months Ended

Jan. 31, 2017

Investments and Deposits [Abstract]

Investments and Deposits [Text Block]

2.	INVESTMENTS

The Company’s equity method investment is accounted for under ASC 323 “Investments-Equity Method and Joint Ventures”. The following table summarizes the investment at January 31, 2017 and 2016 (amounts in thousands):

Entity	Ownership Percentage		Carrying Amount January 31, 2017		Carrying Amount January 31, 2016

Big River Resources, LLC		9.7%	$	37,833	$	38,707

The Company invested $20.0 million in Big River, a holding company for several entities, for a 9.7% ownership interest. Big River Resources West Burlington, LLC, a wholly owned subsidiary of Big River, operates an ethanol manufacturing plant in West Burlington, Iowa. During fiscal year 2016, the plant shipped 107 million gallons of ethanol. The plant has been in operation since 2004. Big River Resources Galva, LLC, a wholly owned subsidiary of Big River, operates an ethanol manufacturing plant in Galva, Illinois. During fiscal year 2016, the plant shipped 125 million gallons of ethanol. The plant has been in operation since 2009. Big River Resources United Energy, LLC, a 55.3% owned subsidiary of Big River, operates an ethanol manufacturing plant in Dyersville, Iowa. During fiscal year 2016, the plant shipped 128 million gallons of ethanol. Big River acquired a 50.5% ownership interest in this plant in 2009 and increased its ownership to 55.3% during fiscal year 2015. Big River Resources Boyceville, LLC, a wholly owned subsidiary of Big River, operates an ethanol manufacturing plant in Boyceville, Wisconsin. During fiscal year 2016, the plant shipped 57 million gallons of ethanol. Big River acquired its interest in this plant in 2011. The Company recorded income of approximately $6.1 million, $6.0 million and $18.2 million as its share of earnings from Big River during fiscal years 2016, 2015 and 2014, respectively. The Company received dividends of approximately $7.0 million, $7.5 million and $18.0 million from Big River during fiscal years 2016, 2015 and 2014, respectively. At January 31, 2017, the carrying value of the investment in Big River is approximately $37.8 million; the amount of underlying equity in the net assets of Big River is approximately $37.2 million.

The Company invested $17.9 million in Patriot for a 27% ownership interest. Patriot operated an ethanol manufacturing plant in Annawan, Illinois. On June 1, 2015, Patriot and a subsidiary of CHS Inc. (“CHS”) completed a merger that resulted in CHS acquiring 100% of the ownership interest in Patriot. The Company received a cash payment of approximately $45.5 million at the closing, representing its proportionate share of the merger consideration for its 27% ownership interest. The total merger consideration was approximately $196 million in cash subject to certain adjustments and certain escrow holdbacks. In connection with this transaction, the Company recognized a gain of approximately $10.4 million during fiscal year 2015. During fiscal year 2016, the Company received proceeds of approximately $4.5 million as partial payment for certain escrow holdbacks and adjustments to the purchase price. As a result, the Company recognized approximately $0.2 million as gain on sale of investment during the first quarter of fiscal year 2016. At January 31, 2017, the Company has approximately $0.1 million in accounts receivable on the accompanying Consolidated Balance Sheets related to estimated escrow proceeds that were recognized as income in fiscal year 2015.

The Company recorded income of approximately $2.9 million and $14.0 million as its share of earnings from Patriot during fiscal years 2015 and 2014, respectively. The Company received dividends of approximately $3.6 million and $4.9 million from Patriot during fiscal years 2015 and 2014, respectively.

Undistributed earnings of equity method investees totaled approximately $17.8 million and $18.7 million at January 31, 2017 and 2016, respectively. Summarized financial information for the Company’s equity method investee as of its fiscal year end is presented in the following table (amounts in thousands):

As of December 31, 2016

	Big River

Current assets	$	175,299
Non current assets		311,450
Total assets	$	486,749
Current liabilities	$	50,798
Long-term liabilities		—
Total liabilities	$	50,798
Noncontrolling interests	$	52,336

As of December 31, 2015

	Big River

Current assets	$	137,758
Non current assets		341,907
Total assets	$	479,665
Current liabilities	$	49,224
Long-term liabilities		—
Total liabilities	$	49,224
Noncontrolling interests	$	48,156

Summarized financial information for each of the Company’s equity method investees is presented in the following table for the years ended December 31, 2016, 2015 and 2014 (amounts in thousands):

Year Ended December 31, 2016

	Big River

Net sales and revenue	$	851,434
Gross profit	$	88,841
Income from continuing operations	$	63,292
Net income	$	63,292

Year Ended December 31, 2015

	Patriot (1)		Big River

Net sales and revenue	$	115,614	$	863,554
Gross profit	$	14,424	$	85,451
Income from continuing operations	$	11,100	$	62,193
Net income	$	11,100	$	62,193

(1)	For Patriot, results are for the five month period ended May 31, 2015 as the Company’s equity interest in Patriot was sold June 1, 2015.

Year Ended December 31, 2014

	Patriot		Big River

Net sales and revenue	$	331,260	$	1,184,505
Gross profit	$	59,980	$	241,963
Income from continuing operations	$	52,875	$	187,388
Net income	$	52,875	$	187,388

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, 2017 are approximately $278.7 million. At January 31, 2017, the Company’s proportionate share of restricted net assets of Big River is approximately $27.0 million.

FAIR VALUE

12 Months Ended

Jan. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

3.	FAIR VALUE

The Company applies 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 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, 2017 on a recurring basis are summarized below (amounts in thousands):

	Level 1		Level 2		Level 3		Total Fair Value

Commodity futures (3)	$	—	$	45	$	—	$	45
Forward purchase contracts asset (4)		—		163		—		163
Investment in cooperative (1)		—		—		333		333
Total assets	$	—	$	208	$	333	$	541

Forward purchase contracts liability (2)	$	—	$	136	$	—	$	136

Financial assets and liabilities measured at fair value at January 31, 2016 on a recurring basis are summarized below (amounts in thousands):

	Level 1		Level 2		Level 3		Total Fair Value

Investment in cooperative (1)	$	—	$	—	$	333	$	333

Forward purchase contracts liability (2)	$	—	$	312	$	—	$	312

(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.

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.

The Company reviews its long-lived assets for impairment on at least an annual basis based on the carrying value of these assets. As a result of vacancies at owned real estate locations, the Company tested certain long-lived assets for impairment using a fair value measurement approach. The fair value measurement approach utilizes a number of significant unobservable inputs or Level 3 assumptions. These assumptions include, among others, the implied fair value of these assets using an income approach by preparing a discounted cash flow analysis and the implied fair value of these assets using recent sales data of comparable properties, and other subjective assumptions. Upon completion of its impairment analysis, which was performed at various times throughout fiscal year 2014, the Company determined that the carrying value of certain long-lived assets exceeded the fair value of these assets. Accordingly, in fiscal year 2014, the Company recorded long-lived asset impairment charges of approximately $68,000. There were no assets measured at fair value at January 31, 2016 and 2015 on a non-recurring basis.

- 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, 2017

Disclosure Text Block Supplement [Abstract]

Other Assets Disclosure [Text Block]

4.	OTHER ASSETS

The components of other noncurrent assets at January 31, 2017 and 2016 are as follows (amounts in thousands):

	January 31,
	2017		2016

Real estate taxes refundable	$	5,923	$	5,091
Deposits		155		664
Other		835		887

Total	$	6,913	$	6,642

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. Deposits are with vendors and governmental authorities.

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

12 Months Ended

Jan. 31, 2017

Disclosure Text Block Supplement [Abstract]

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

5.	ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

The components of accrued expenses and other current liabilities at January 31, 2017 and 2016 are as follows (amounts in thousands):

	January 31,
	2017		2016

Accrued utility charges	$	2,414	$	2,094
Accrued payroll and related items		4,279		3,760
Accrued real estate taxes		2,716		2,564
Accrued income taxes		2,120		—
Other		1,819		1,005

Total	$	13,348	$	9,423

NET INCOME PER SHARE FROM CONTINUING OPERATIONS

12 Months Ended

Jan. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

6.	NET INCOME PER SHARE FROM CONTINUING OPERATIONS

The Company reports net income per share in accordance with ASC 260, “Earnings per Share”. Basic net income per share is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the year. Diluted net income per share is computed by dividing net income available to common shareholders by the weighted average number of shares outstanding and dilutive common share equivalents during the year. Common share equivalents for each year include the number of shares issuable upon the exercise of outstanding options or restricted stock awards, less the shares that could be purchased under the treasury stock method. For fiscal years 2015 and 2014 all shares subject to outstanding options were dilutive.

The following table reconciles the basic and diluted net income per share amounts from continuing operations computations for each year presented for fiscal years 2015 and 2014 (amounts in thousands, except per-share amounts):

	2015
	Income		Shares		Per Share

Basic net income per share from continuing operations attributable to REX common shareholders	$	31,436		7,297	$	4.31
Effect of restricted stock				10
Diluted net income per share from continuing operations attributable to REX common shareholders	$	31,436		7,307	$	4.30

	2014
	Income		Shares		Per Share

Basic net income per share from continuing operations attributable to REX common shareholders	$	86,776		8,109	$	10.70
Effect of stock options				9
Diluted net income per share from continuing operations attributable to REX common shareholders	$	86,776		8,118	$	10.69

LEASES

12 Months Ended

Jan. 31, 2017

Leases [Abstract]

Leases of Lessor Disclosure [Text Block]

LEASES

At January 31, 2017, the Company has lease agreements, as lessee, for rail cars and a natural gas pipeline. All of the leases are accounted for as operating leases. As of January 31, 2017, future minimum annual rentals on such leases are as follows (amounts in thousands):

Years Ended January 31,	Minimum Rentals

2018	$	7,022
2019		6,108
2020		4,577
2021		2,778
2022		2,547
Thereafter		1,622
	$	24,654

COMMON STOCK

12 Months Ended

Jan. 31, 2017

Stockholders' Equity Note [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

8.	COMMON STOCK

During fiscal years 2016, 2015 and 2014, the Company purchased 87,904 shares, 1,254,344 shares and 283,979 shares, respectively, of its common stock for approximately $4,353,000, $70,208,000 and $18,238,000, respectively. Included in these amounts are shares the Company received totaling 1,555 for the year ended January 31, 2015 as tenders of the exercise price of stock options exercised by certain officers and directors of the Company. The cost of these shares, determined as the fair market value on the date they were tendered, was approximately $100,000 for the year ended January 31, 2015. At January 31, 2017, the Company had prior authorization by its Board of Directors to purchase, in open market transactions, an additional 155,334 shares of its common stock. Information regarding the Company’s common stock is as follows (amounts in thousands):

	January 31,

	2017		2016
Authorized shares		45,000		45,000
Issued shares		29,853		29,853
Outstanding shares		6,561		6,648

REVOLVING LINES OF CREDIT

12 Months Ended

Jan. 31, 2017

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

9.	REVOLVING LINES OF CREDIT

Effective April 1, 2016, One Earth and NuGen each entered into $10.0 million revolving loan facilities that mature April 1, 2017. 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 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 250 basis points. Neither One Earth nor NuGen had outstanding borrowings on the revolving loans during the year ended January 31, 2017. One Earth and NuGen are also subject to certain financial covenants under the revolving loan facilities, including working capital requirements, should they borrow on the loans.

DERIVATIVE FINANCIAL INSTRUMENTS

12 Months Ended

Jan. 31, 2017

Disclosure Text Block Supplement [Abstract]

Financial Instruments Disclosure [Text Block]

10.	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,
	2017		2016		2017		2016

Commodity futures (1)	$	45	$	—	$	—	$	—
Forward purchase contracts (2)	$	163	$	—	$	136	$	312

(1)

Commodity futures are included in prepaid expense and other. These contracts are short/sell positions for approximately 0.7 million bushels of corn.

(2) Forward purchase contracts assets are included in prepaid expenses and other while forward purchase contracts liabilities are included in accrued expenses and other current liabilities. These contracts are for purchases of approximately 5.3 million bushels of corn at January 31, 2017 and 0.7 million bushels of corn at January 31, 2016.

As of January 31, 2017, 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, 2017, 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, 2017, the Company was required to maintain collateral with the counterparty in the amount of approximately $131,000 to secure the Company’s derivative liability position.

See Note 3 which contains fair value information related to derivative financial instruments.

The following table provides information about gains recognized in income on the Company’s derivative financial instruments and the line items on the Consolidated Statements of Operations in which the fair values are reflected for fiscal years 2016, 2015 and 2014 (in thousands):

	2016			2015			2014

Cost of sales	$	(2,131	)	$	(382	)	$	—

EMPLOYEE BENEFITS

12 Months Ended

Jan. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

11.	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, 2017, 525,330 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.

At January 31, 2017 and 2016, unrecognized compensation cost related to nonvested restricted stock was approximately $214,000 and $136,000, respectively.

The following table summarizes non-vested restricted stock award activity for the fiscal years 2016 and 2015:

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

	2015
			Weighted		Weighted
			Average Grant		Remaining Vesting
	Non-Vested		Date Fair Value		Vesting Term
	Shares		(000’s)		(in years)

Non-Vested at January 31, 2015		—	$	—
Granted		3,168		200
Forfeited		—		—
Vested		—		—

Non-Vested at January 31, 2016		3,168	$	200		2

The following summarizes stock option activity for fiscal year 2014:

	2014
				Weighted
				Average
	Shares			Exercise
	(000’s)			Price

Outstanding—Beginning of year		84		$	12.37
Exercised		(84	)		12.37
Canceled or expired		—			—

Outstanding—End of year		—

Exercisable—End of year		—

COMMITMENTS

12 Months Ended

Jan. 31, 2017

Disclosure Text Block Supplement [Abstract]

Commitments Disclosure [Text Block]

12.	COMMITMENTS

One Earth and NuGen have combined forward purchase contracts for approximately 7.7 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 2017.

One Earth and NuGen have combined sales commitments for approximately 59.7 million gallons of ethanol, 67,000 tons of distillers grains and 14.4 million pounds of non-food grade corn oil. They expect to deliver the ethanol, distillers grains and corn oil through June 2017.

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. Payments began in February 2009. One Earth paid approximately $438,000 pursuant to the lease in each of fiscal years 2016, 2015 and 2014.

One Earth and NuGen have entered into agreements with unrelated parties for the lease of railcars that will be used to ship ethanol and distillers grains. These leases expire on various dates through February 1, 2024. One Earth and NuGen pay a monthly lease amount per railcar. One Earth and NuGen combined incurred expenses of approximately $8,515,000, $7,221,000 and $7,024,000 pursuant to the leases in fiscal years 2016, 2015 and 2014, respectively.

One Earth and NuGen each have a contract with an unrelated party (“Distillers Grains Marketer”) 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 incurred fees of approximately $1,194,000, $1,169,000 and $1,190,000 in fiscal years 2016, 2015 and 2014, respectively, for these marketing services.

One Earth has a grain origination agreement with Alliance Grain, a minority equity owner, under which it purchased 100% of its grain during fiscal years 2016, 2015 and 2014. One Earth pays to Alliance Grain a certain amount per bushel for procurement fees. The term of the agreement expires October 31, 2016, 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 180 days prior to the expiration of the then current term of the agreement.

INCOME TAXES

12 Months Ended

Jan. 31, 2017

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

13.

INCOME TAXES

The provision (benefit) for income taxes for fiscal years 2016, 2015 and 2014 consists of the following (amounts in thousands):

	2016			2015			2014

Federal:
Current	$	12,197		$	15,804		$	23,452
Deferred		3,568			(2,867	)		20,717

		15,765			12,937			44,169

State and Local:
Current		2,153			2,651			3,536
Deferred		(525	)		(1,480	)		1,944

		1,628			1,171			5,480

Provision for income taxes	$	17,393		$	14,108		$	49,649

The tax effects of significant temporary differences representing deferred tax assets and liabilities are as follows as of January 31, 2017 and 2016 (amounts in thousands):

	January 31,
	2017			2016

Assets:
Accrued liabilities	$	539		$	915
State net operating loss carryforward		412			1,147
Other items		513			198
Valuation allowance		(417	)		(1,151	)

Total		1,047			1,109
Liabilities:
Basis in pass through entities, including depreciation		(41,080	)		(37,834	)
Other		(278	)		(543	)

Total		(41,358	)		(38,377	)
Net deferred tax liability	$	(40,311	)	$	(37,268	)

The Company has a valuation allowance of approximately $417,000 at January 31, 2017. The Company decreased the valuation allowance by $734,000, $601,000 and $265,000 in fiscal years 2016, 2015 and 2014, respectively. These adjustments to the valuation allowance are a result of estimates of realizing certain future state tax benefits and federal capital loss carryforwards.

The Company paid income taxes of approximately $7,090,000, $20,253,000 and $30,142,000 in fiscal years 2016, 2015 and 2014, respectively. The Company received refunds of income taxes of approximately $150,000, $132,000 and $53,000 in fiscal years 2016, 2015 and 2014, respectively.

The effective income tax rate on consolidated pre-tax income or loss differs from the federal income tax statutory rate for fiscal years 2016, 2015 and 2014 as follows:

	2016			2015			2014

Federal income tax at statutory rate		35.0	%		35.0	%		35.0	%
State and local taxes, net of federal tax benefit		2.3			(1.3	)		3.6
Net change in valuation allowance		—			(1.2	)		(0.2	)
Domestic production activities deduction		(2.9	)		(1.7	)		(1.1	)
Uncertain tax positions		0.8			1.0			—
Noncontrolling interest		(4.6	)		(4.4	)		(4.0	)
Other		—			—			(0.8	)

Total		30.6	%		27.4	%		32.5	%

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, 2010 and prior.

The Company applies the provisions of ASC 740-10-25-5 for uncertain tax positions. As of January 31, 2017, total unrecognized tax benefits were approximately $1,875,000, and accrued penalties and interest were approximately $221,000. If the Company were to prevail on all unrecognized tax benefits recorded, the provision for income taxes would be reduced by approximately $1,297,000. 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):

	Years Ended January 31,
	2017		2016

Unrecognized tax benefits, beginning of year	$	987	$	1,658
Changes for tax positions for prior years		1,109		(1,658	)
Changes for tax positions for current year		—		987

Unrecognized tax benefits, end of year	$	2,096	$	987

DISCONTINUED OPERATIONS

12 Months Ended

Jan. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]

14.	DISCONTINUED OPERATIONS

During fiscal year 2009, the Company completed the exit of its retail business. Accordingly, certain operations of the Company’s former retail operations and certain sold properties had been classified as discontinued operations prior to the prospective adoption of ASU 2014-08 effective February 1, 2015. No items were reclassified as discontinued operations for fiscal years 2016 or 2015. Below is a table reflecting certain items of the Consolidated Statement of Operations that were reclassified as discontinued operations for fiscal year 2014 (amounts in thousands):

	2014

Net sales and revenue	$	47

Cost of sales	$	(321	)

Income before income taxes	$	368
Provision for income taxes		(134	)
Income from discontinued operations, net of tax	$	234

Gain on disposal before provision for income taxes	$	513
Provision for income taxes		(186	)
Gain on disposal of discontinued operations, net of tax	$	327

CONTINGENCIES

12 Months Ended

Jan. 31, 2017

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, 2017 or 2016 as the Company did not believe that there was a probable and reasonably estimable loss associated with any legal contingencies.

NET SALES AND REVENUE

12 Months Ended

Jan. 31, 2017

Net Sales And Revenue [Abstract]

Net Sales And Revenue [Text Block]

16.

NET SALES AND REVENUE

The following table summarizes sales for each product and service group for the periods presented (amounts in thousands):

	Fiscal Year
Product or Service Category	2016		2015		2014

Ethanol	$	358,349	$	333,200	$	452,831
Dried distillers grains		71,204		81,116		96,328
Non-food grade corn oil		18,518		15,510		16,985
Modified distillers grains		5,326		5,999		4,814
Other		402		663		1,272
Total	$	453,799	$	436,488	$	572,230

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

QUARTERLY UNAUDITED INFORMATION

12 Months Ended

Jan. 31, 2017

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,
	2016		2016		2016		2017

Net sales and revenue	$	100,222	$	115,707	$	116,283	$	121,587
Gross profit		8,422		17,284		20,162		25,171
Net income		3,466		9,029		11,474		15,549
Net income attributable to REX common shareholders		2,838		8,176		8,938		12,381
Basic net income per share attributable to REX common shareholders	$	0.43	$	1.24	$	1.36	$	1.88
Diluted net income per share attributable to REX common shareholders	$	0.43	$	1.24	$	1.36	$	1.88

	Quarters Ended
	(In Thousands, Except Per Share Amounts)
	April 30,		July 31,		October 31,		January 31,
	2015		2015		2015		2016

Net sales and revenue	$	105,197	$	113,480	$	110,584	$	107,227
Gross profit		9,127		18,276		14,273		9,158
Net income		4,439		18,711		9,433		4,827
Net income attributable to REX common shareholders		3,927		16,367		7,456		3,686
Basic net income per share attributable to REX common shareholders (a)	$	0.50	$	2.16	$	1.08	$	0.54
Diluted net income per share attributable to REX common shareholders (a)	$	0.50	$	2.16	$	1.08	$	0.54

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, 2017

18.	RELATED PARTIES

During fiscal years 2016, 2015 and 2014, One Earth and NuGen purchased approximately $148.5 million, $148.2 million and $164.7 million, respectively, of corn from minority equity investors. The Company had amounts payable to related parties for corn purchases of approximately $1.7 million and $1.2 million at January 31, 2017, and 2016, respectively.

Schedule II - VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Jan. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Schedule II - VALUATION AND QUALIFYING ACCOUNTS

FOR THE YEARS ENDED JANUARY 31, 2017, 2016 AND 2015

(Amounts in thousands)

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

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

2016:
Deferred tax valuation allowance	$	1,752	$	–	$	601	$	1,151

2015:
Deferred tax valuation allowance	$	2,017	$	–	$	265	$	1,752

Accounting Policies, by Policy (Policies)

12 Months Ended

Jan. 31, 2017

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,
	2017		2016

Ethanol and other finished goods	$	5,262	$	3,105
Work in process		2,359		2,652
Grain and other raw materials		9,436		11,421

Total	$	17,057	$	17,178

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

	January 31,
	2017			2016

Land and improvements	$	20,951		$	21,598
Buildings and improvements		23,203			24,543
Machinery, equipment and fixtures		255,348			237,735
Construction in progress		1,046			6,094

		300,548			289,970
Less: accumulated depreciation		(117,787	)		(99,994	)

Total	$	182,761		$	189,976

Depreciation expense was approximately $19,519,000, $18,638,000 and $16,387,000 in fiscal years 2016, 2015 and 2014, respectively.

Investment, Policy [Policy Text Block]

Revenue Recognition, Policy [Policy Text Block]

Cost of Sales, Policy [Policy Text Block]

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

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

Interest Expense, Policy [Policy Text Block]

Interest Expense – There was no cash paid for interest in fiscal years 2016 and 2015. Cash paid for interest in fiscal year 2014 was approximately $2,136,000.

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

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

Income Tax, Policy [Policy Text Block]

Discontinued Operation [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, 2017

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

The components of inventory at January 31, 2017, and January 31, 2016 are as follows (amounts in thousands):

	January 31,
	2017		2016

Ethanol and other finished goods	$	5,262	$	3,105
Work in process		2,359		2,652
Grain and other raw materials		9,436		11,421

Total	$	17,057	$	17,178

Property, Plant and Equipment [Table Text Block]

The components of property and equipment at January 31, 2017 and 2016 are as follows (amounts in thousands):

	January 31,
	2017			2016

Land and improvements	$	20,951		$	21,598
Buildings and improvements		23,203			24,543
Machinery, equipment and fixtures		255,348			237,735
Construction in progress		1,046			6,094

		300,548			289,970
Less: accumulated depreciation		(117,787	)		(99,994	)

Total	$	182,761		$	189,976

INVESTMENTS (Tables)

12 Months Ended

Jan. 31, 2017

Investments and Deposits [Abstract]

Equity Method Investments [Table Text Block]

The following table summarizes the investment at January 31, 2017 and 2016 (amounts in thousands):

Entity	Ownership Percentage		Carrying Amount January 31, 2017		Carrying Amount January 31, 2016

Big River Resources, LLC		9.7%	$	37,833	$	38,707

Condensed Balance Sheet [Table Text Block]

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

	Big River

Current assets	$	175,299
Non current assets		311,450
Total assets	$	486,749
Current liabilities	$	50,798
Long-term liabilities		—
Total liabilities	$	50,798
Noncontrolling interests	$	52,336

	Big River

Current assets	$	137,758
Non current assets		341,907
Total assets	$	479,665
Current liabilities	$	49,224
Long-term liabilities		—
Total liabilities	$	49,224
Noncontrolling interests	$	48,156

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

Summarized financial information for each of the Company’s equity method investees is presented in the following table for the years ended December 31, 2016, 2015 and 2014 (amounts in thousands):

	Big River

Net sales and revenue	$	851,434
Gross profit	$	88,841
Income from continuing operations	$	63,292
Net income	$	63,292

	Patriot (1)		Big River

Net sales and revenue	$	115,614	$	863,554
Gross profit	$	14,424	$	85,451
Income from continuing operations	$	11,100	$	62,193
Net income	$	11,100	$	62,193

	Patriot		Big River

Net sales and revenue	$	331,260	$	1,184,505
Gross profit	$	59,980	$	241,963
Income from continuing operations	$	52,875	$	187,388
Net income	$	52,875	$	187,388

FAIR VALUE (Tables)

12 Months Ended

Jan. 31, 2017

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, 2017 on a recurring basis are summarized below (amounts in thousands):

	Level 1		Level 2		Level 3		Total Fair Value

Commodity futures (3)	$	—	$	45	$	—	$	45
Forward purchase contracts asset (4)		—		163		—		163
Investment in cooperative (1)		—		—		333		333
Total assets	$	—	$	208	$	333	$	541

Forward purchase contracts liability (2)	$	—	$	136	$	—	$	136

	Level 1		Level 2		Level 3		Total Fair Value

Investment in cooperative (1)	$	—	$	—	$	333	$	333

Forward purchase contracts liability (2)	$	—	$	312	$	—	$	312

(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.

OTHER ASSETS (Tables)

12 Months Ended

Jan. 31, 2017

Disclosure Text Block Supplement [Abstract]

Schedule of Other Assets [Table Text Block]

The components of other noncurrent assets at January 31, 2017 and 2016 are as follows (amounts in thousands):

	January 31,
	2017		2016

Real estate taxes refundable	$	5,923	$	5,091
Deposits		155		664
Other		835		887

Total	$	6,913	$	6,642

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)

12 Months Ended

Jan. 31, 2017

Disclosure Text Block Supplement [Abstract]

Other Current Liabilities [Table Text Block]

The components of accrued expenses and other current liabilities at January 31, 2017 and 2016 are as follows (amounts in thousands):

	January 31,
	2017		2016

Accrued utility charges	$	2,414	$	2,094
Accrued payroll and related items		4,279		3,760
Accrued real estate taxes		2,716		2,564
Accrued income taxes		2,120		—
Other		1,819		1,005

Total	$	13,348	$	9,423

NET INCOME PER SHARE FROM CONTINUING OPERATIONS (Tables)

12 Months Ended

Jan. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	2015
	Income		Shares		Per Share

Basic net income per share from continuing operations attributable to REX common shareholders	$	31,436		7,297	$	4.31
Effect of restricted stock				10
Diluted net income per share from continuing operations attributable to REX common shareholders	$	31,436		7,307	$	4.30

	2014
	Income		Shares		Per Share

Basic net income per share from continuing operations attributable to REX common shareholders	$	86,776		8,109	$	10.70
Effect of stock options				9
Diluted net income per share from continuing operations attributable to REX common shareholders	$	86,776		8,118	$	10.69

LEASES (Tables)

12 Months Ended

Jan. 31, 2017

Leases [Abstract]

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

Years Ended January 31,	Minimum Rentals

2018	$	7,022
2019		6,108
2020		4,577
2021		2,778
2022		2,547
Thereafter		1,622
	$	24,654

COMMON STOCK (Tables)

12 Months Ended

Jan. 31, 2017

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,

	2017		2016
Authorized shares		45,000		45,000
Issued shares		29,853		29,853
Outstanding shares		6,561		6,648

- 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.

+ References

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+ Details

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Jan. 31, 2017

Jan. 31, 2016

Disclosure Text Block Supplement [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,
	2017		2016		2017		2016

Commodity futures (1)	$	45	$	—	$	—	$	—
Forward purchase contracts (2)	$	163	$	—	$	136	$	312

(1)

Commodity futures are included in prepaid expense and other. These contracts are short/sell positions for approximately 0.7 million bushels of corn.

Derivative Instruments, Gain (Loss) [Table Text Block]

	2016			2015			2014

Cost of sales	$	(2,131	)	$	(382	)	$	—

EMPLOYEE BENEFITS (Tables)

12 Months Ended

Jan. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Nonvested Restricted Stock Shares Activity [Table Text Block]

The following table summarizes non-vested restricted stock award activity for the fiscal years 2016 and 2015:

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

	2015
			Weighted		Weighted
			Average Grant		Remaining Vesting
	Non-Vested		Date Fair Value		Vesting Term
	Shares		(000’s)		(in years)

Non-Vested at January 31, 2015		—	$	—
Granted		3,168		200
Forfeited		—		—
Vested		—		—

Non-Vested at January 31, 2016		3,168	$	200		2

Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price [Table Text Block]

The following summarizes stock option activity for fiscal year 2014:

	2014
				Weighted
				Average
	Shares			Exercise
	(000’s)			Price

Outstanding—Beginning of year		84		$	12.37
Exercised		(84	)		12.37
Canceled or expired		—			—

Outstanding—End of year		—

Exercisable—End of year		—

INCOME TAXES (Tables)

12 Months Ended

Jan. 31, 2017

Income Tax Disclosure [Abstract]

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

The provision (benefit) for income taxes for fiscal years 2016, 2015 and 2014 consists of the following (amounts in thousands):

	2016			2015			2014

Federal:
Current	$	12,197		$	15,804		$	23,452
Deferred		3,568			(2,867	)		20,717

		15,765			12,937			44,169

State and Local:
Current		2,153			2,651			3,536
Deferred		(525	)		(1,480	)		1,944

		1,628			1,171			5,480

Provision for income taxes	$	17,393		$	14,108		$	49,649

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 as of January 31, 2017 and 2016 (amounts in thousands):

	January 31,
	2017			2016

Assets:
Accrued liabilities	$	539		$	915
State net operating loss carryforward		412			1,147
Other items		513			198
Valuation allowance		(417	)		(1,151	)

Total		1,047			1,109
Liabilities:
Basis in pass through entities, including depreciation		(41,080	)		(37,834	)
Other		(278	)		(543	)

Total		(41,358	)		(38,377	)
Net deferred tax liability	$	(40,311	)	$	(37,268	)

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 2016, 2015 and 2014 as follows:

	2016			2015			2014

Federal income tax at statutory rate		35.0	%		35.0	%		35.0	%
State and local taxes, net of federal tax benefit		2.3			(1.3	)		3.6
Net change in valuation allowance		—			(1.2	)		(0.2	)
Domestic production activities deduction		(2.9	)		(1.7	)		(1.1	)
Uncertain tax positions		0.8			1.0			—
Noncontrolling interest		(4.6	)		(4.4	)		(4.0	)
Other		—			—			(0.8	)

Total		30.6	%		27.4	%		32.5	%

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):

	Years Ended January 31,
	2017		2016

Unrecognized tax benefits, beginning of year	$	987	$	1,658
Changes for tax positions for prior years		1,109		(1,658	)
Changes for tax positions for current year		—		987

Unrecognized tax benefits, end of year	$	2,096	$	987

DISCONTINUED OPERATIONS (Tables)

12 Months Ended

Jan. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations [Table Text Block]

Below is a table reflecting certain items of the Consolidated Statement of Operations that were reclassified as discontinued operations for fiscal year 2014 (amounts in thousands):

	2014

Net sales and revenue	$	47

Cost of sales	$	(321	)

Income before income taxes	$	368
Provision for income taxes		(134	)
Income from discontinued operations, net of tax	$	234

Gain on disposal before provision for income taxes	$	513
Provision for income taxes		(186	)
Gain on disposal of discontinued operations, net of tax	$	327

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721659-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

NET SALES AND REVENUE (Tables)

12 Months Ended

Jan. 31, 2017

Net Sales And Revenue [Abstract]

Revenue from External Customers by Products and Services [Table Text Block]

The following table summarizes sales for each product and service group for the periods presented (amounts in thousands):

	Fiscal Year
Product or Service Category	2016		2015		2014

Ethanol	$	358,349	$	333,200	$	452,831
Dried distillers grains		71,204		81,116		96,328
Non-food grade corn oil		18,518		15,510		16,985
Modified distillers grains		5,326		5,999		4,814
Other		402		663		1,272
Total	$	453,799	$	436,488	$	572,230

QUARTERLY UNAUDITED INFORMATION (Tables)

12 Months Ended

Jan. 31, 2017

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,
	2016		2016		2016		2017

Net sales and revenue	$	100,222	$	115,707	$	116,283	$	121,587
Gross profit		8,422		17,284		20,162		25,171
Net income		3,466		9,029		11,474		15,549
Net income attributable to REX common shareholders		2,838		8,176		8,938		12,381
Basic net income per share attributable to REX common shareholders	$	0.43	$	1.24	$	1.36	$	1.88
Diluted net income per share attributable to REX common shareholders	$	0.43	$	1.24	$	1.36	$	1.88

	Quarters Ended
	(In Thousands, Except Per Share Amounts)
	April 30,		July 31,		October 31,		January 31,
	2015		2015		2015		2016

Net sales and revenue	$	105,197	$	113,480	$	110,584	$	107,227
Gross profit		9,127		18,276		14,273		9,158
Net income		4,439		18,711		9,433		4,827
Net income attributable to REX common shareholders		3,927		16,367		7,456		3,686
Basic net income per share attributable to REX common shareholders (a)	$	0.50	$	2.16	$	1.08	$	0.54
Diluted net income per share attributable to REX common shareholders (a)	$	0.50	$	2.16	$	1.08	$	0.54

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, 2017 USD ($) shares	Jan. 31, 2016 USD ($)	Jan. 31, 2015 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Number of Ethanol Entities Under Ownership Interest	3
Concentration Risk Number of Customer	5	4	4
Property, Plant and Equipment, Depreciation Methods	Depreciation is computed using the straight-line method.
Impairment of Real Estate		$ 125,000	$ 68,000
Depreciation	$ 19,519,000	18,638,000	16,387,000
Interest Paid			2,136,000
Assets	$ 454,024,000	414,685,000
Derivative Settlement on Interest Rate Swap			$ 1,142,000
Employee Stock Ownership Plan (ESOP), Shares in ESOP (in Shares) \| shares	550,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		4,000,000
Deferred Tax Expense from Stock Options Exercised		$ 800,000
Customer Concentration Risk [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Percentage	83.00%	75.00%	74.00%
Accounts Receivable Balance [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Percentage	88.00%	47.00%
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%
Building and Building Improvements [Member] \| Minimum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	15
Building and Building Improvements [Member] \| Maximum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	40 years
Fixtures And Equipment [Member] \| Minimum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	2
Fixtures And Equipment [Member] \| Maximum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	20 years
Not Accounted For Under "Normal Purchases and Normal Sales" Scope [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Assets	$ 200,000
Liabilities	$ 100,000	$ 300,000

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Schedule of components of inventory - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule of components of inventory [Abstract]
Ethanol and other finished goods	$ 5,262	$ 3,105
Work in process	2,359	2,652
Grain and other raw materials	9,436	11,421
Total	$ 17,057	$ 17,178

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Schedule of Property Plant and Equipment - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule of Property Plant and Equipment [Abstract]
Land and improvements	$ 20,951	$ 21,598
Buildings and improvements	23,203	24,543
Machinery, equipment and fixtures	255,348	237,735
Construction in progress	1,046	6,094
	300,548	289,970
Less: accumulated depreciation	(117,787)	(99,994)
Total	$ 182,761	$ 189,976

INVESTMENTS (Details) $ in Thousands, gal in Millions	3 Months Ended	12 Months Ended
INVESTMENTS (Details) $ in Thousands, gal in Millions	Apr. 30, 2016 USD ($)	Jan. 31, 2017 USD ($) gal	Jan. 31, 2016 USD ($)	Jan. 31, 2015 USD ($)	Jan. 31, 2009
INVESTMENTS (Details) [Line Items]
Income (Loss) from Equity Method Investments		$ 6,144	$ 8,984	$ 32,229
Equity Method Investments		37,833	38,707
Gain (Loss) on Sale of Investments	$ 200	192	10,385
Accounts Receivable, Net, Current		11,901	13,666
Retained Earnings, Undistributed Earnings from Equity Method Investees		17,800	18,700
Big River [Member]
INVESTMENTS (Details) [Line Items]
Agreement to Invest During Year		$ 20,000
Equity Method Investment, Ownership Percentage		9.70%
Income (Loss) from Equity Method Investments		$ 6,100	6,000	18,200
Proceeds from Equity Method Investment, Distribution		7,000	7,500	18,000
Equity Method Investments		37,833	$ 38,707
Equity Method Investment, Underlying Equity in Net Assets		37,200
Other Restricted Assets		278,700
Proportionate Share of Restricted Net Assets		$ 27,000
Big River [Member] \| Burlington [Member]
INVESTMENTS (Details) [Line Items]
Quantity of ethanol shipped (in US Gallons) \| gal		107
Big River [Member] \| Illinois [Member]
INVESTMENTS (Details) [Line Items]
Quantity of ethanol shipped (in US Gallons) \| gal		125
Big River [Member] \| Dyersville [Member]
INVESTMENTS (Details) [Line Items]
Equity Method Investment, Ownership Percentage			55.30%		50.50%
Quantity of ethanol shipped (in US Gallons) \| gal		128
Big River [Member] \| Boyceville [Member]
INVESTMENTS (Details) [Line Items]
Quantity of ethanol shipped (in US Gallons) \| gal		57
Big River [Member] \| Big River Resources United Energy LLC [Member]
INVESTMENTS (Details) [Line Items]
Equity Method Investment, Ownership Percentage		55.30%
Patriot [Member]
INVESTMENTS (Details) [Line Items]
Equity Method Investment, Ownership Percentage		27.00%
Income (Loss) from Equity Method Investments			$ 2,900	14,000
Proceeds from Equity Method Investment, Distribution			$ 3,600	$ 4,900
Equity Method Initial Investments		$ 17,900
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Gain (Loss) on Disposition of Business		$ 45,500
Business Combination, Consideration Transferred		196,000
Gain (Loss) on Sale of Investments		10,400
Proceeds From Payment For Escrow Holdbacks And Adjustments		4,500
Accounts Receivable, Net, Current		$ 100

INVESTMENTS (Details) - Schedule of Equity Method Investments - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule of Equity Method Investments [Line Items]
Big River Resources, LLC	$ 37,833	$ 38,707
Big River [Member]
Schedule of Equity Method Investments [Line Items]
Big River Resources, LLC	9.70%
Big River Resources, LLC	$ 37,833	$ 38,707

INVESTMENTS (Details) - Schedule of Condensed Balance Sheet - USD ($) $ in Thousands	Jan. 31, 2017	Dec. 31, 2016	Jan. 31, 2016	Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Current assets	$ 226,517		$ 179,360
Total assets	454,024		414,685
Current liabilities	$ 22,519		$ 19,635
Big River [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Current assets		$ 175,299
Non current assets		311,450
Total assets		486,749
Current liabilities		50,798
Total liabilities		50,798
Noncontrolling interests		$ 52,336
Patriot [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Current assets				$ 137,758
Non current assets				341,907
Total assets				479,665
Current liabilities				49,224
Total liabilities				49,224
Noncontrolling interests				$ 48,156

- 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://www.xbrl.org/2003/role/presentationRef
-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 2: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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 4: http://www.xbrl.org/2003/role/presentationRef
-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 5: http://www.xbrl.org/2003/role/presentationRef
-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 6: http://www.xbrl.org/2003/role/presentationRef
-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 7: http://www.xbrl.org/2003/role/presentationRef
-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 8: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

INVESTMENTS (Details) - Schedule of Financial information For Equity Method Investment - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2016

^[1]

Dec. 31, 2015

Dec. 31, 2014

Patriot [Member]

INVESTMENTS (Details) - Schedule of Financial information For Equity Method Investment [Line Items]

Net sales and revenue

$ 851,434

$ 863,554

$ 1,184,505

Gross profit

88,841

85,451

241,963

Income from continuing operations

63,292

62,193

187,388

Net income

$ 63,292

62,193

187,388

Big River [Member]

INVESTMENTS (Details) - Schedule of Financial information For Equity Method Investment [Line Items]

Net sales and revenue

115,614

^[1]

331,260

Gross profit

14,424

^[1]

59,980

Income from continuing operations

11,100

^[1]

52,875

Net income

$ 11,100

^[1]

$ 52,875

[1]	For Patriot, results are for the five month period ended May 31, 2015 as the Company's equity interest in Patriot was sold June 1, 2015.

FAIR VALUE (Details)	12 Months Ended
FAIR VALUE (Details)	Jan. 31, 2015 USD ($)
Fair Value Disclosures [Abstract]
Impairment of Long-Lived Assets to be Disposed of	$ 68,000

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

Jan. 31, 2017

Jan. 31, 2016

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

Commodity futures

^[1]

$ 45

Forward purchase contracts asset

^[2]

163

Investment in cooperative (1)

^[3]

333

$ 333

Total assets

541

Forward purchase contracts liability (2)

^[4]

136

312

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]

Forward purchase contracts asset

^[2]

Investment in cooperative (1)

^[3]

Forward purchase contracts liability (2)

^[4]

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]

Forward purchase contracts asset

^[2]

163

Investment in cooperative (1)

^[3]

Total assets

208

Forward purchase contracts liability (2)

^[4]

136

312

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]

Forward purchase contracts asset

^[2]

Investment in cooperative (1)

^[3]

333

Total assets

333

Forward purchase contracts liability (2)

^[4]

[1]	The commodity futures asset is included in "Prepaid expenses and other" on the accompanying Consolidated Balance Sheets.
[2]	The forward purchase contract asset is included in "Prepaid expenses and other" 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.

OTHER ASSETS (Details) - Schedule of Other Assets - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule of Other Assets [Abstract]
Real estate taxes refundable	$ 5,923	$ 5,091
Deposits	155	664
Other	835	887
Total	$ 6,913	$ 6,642

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - Schedule of accrued expenses and other current liabilities - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule of accrued expenses and other current liabilities [Abstract]
Accrued utility charges	$ 2,414	$ 2,094
Accrued payroll and related items	4,279	3,760
Accrued real estate taxes	2,716	2,564
Accrued income taxes	2,120
Other	1,819	1,005
Total	$ 13,348	$ 9,423

NET INCOME PER SHARE FROM CONTINUING OPERATIONS (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars)		$ 31,436	$ 86,776
Basic net income per share from continuing operations attributable to REX common shareholders	6,587	7,297	8,109
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 4.91	$ 4.31	$ 10.70
Effect of restricted stock		10	9
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars)		$ 31,436	$ 86,776
Diluted net income per share from continuing operations attributable to REX common shareholders	6,587	7,307	8,118
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 4.91	$ 4.30	$ 10.69

- Definition

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

+ References + Details

- Definition

The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

LEASES (Details) - Schedule of Future Minimum Rental Payments for Operating Leases $ in Thousands	Jan. 31, 2017 USD ($)
Schedule of Future Minimum Rental Payments for Operating Leases [Abstract]
2018	$ 7,022
2019	6,108
2020	4,577
2021	2,778
2022	2,547
Thereafter	1,622
	$ 24,654

COMMON STOCK (Details) - USD ($)	12 Months Ended
COMMON STOCK (Details) - USD ($)	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
COMMON STOCK (Details) [Line Items]
Treasury Stock, Shares, Acquired	87,904	1,254,344	283,979
Treasury Stock, Value, Acquired, Cost Method (in Dollars)	$ 4,353,000	$ 70,208,000	$ 18,238,000
Stock Repurchase Program Number of Additional Shares Authorized to be Repurchased	155,334
Employee Stock Option [Member]
COMMON STOCK (Details) [Line Items]
Treasury Stock, Shares, Acquired		1,555
Treasury Stock, Value, Acquired, Cost Method (in Dollars)		$ 100,000

COMMON STOCK (Details) - Schedule of Stock by Class - shares shares in Thousands	Jan. 31, 2017	Jan. 31, 2016
Schedule of Stock by Class [Abstract]
Authorized shares	45,000	45,000
Issued shares	29,853	29,853
Outstanding shares	6,561	6,648

REVOLVING LINES OF CREDIT (Details) - One Earth Energy And Nu Gen Energy [Member] - Revolving Credit Facility [Member] $ in Millions	12 Months Ended
	Jan. 31, 2017 USD ($)
REVOLVING LINES OF CREDIT (Details) [Line Items]
Line of Credit, Current	$ 10.0
Debt Instrument, Maturity Date	Apr. 01, 2017
Line of Credit Facility, Interest Rate Description	LIBOR rate plus 250 basis points

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

DERIVATIVE FINANCIAL INSTRUMENTS (Details) bu in Millions	Jan. 31, 2017 USD ($) bu	Jan. 31, 2016 bu
Disclosure Text Block Supplement [Abstract]
Quantity Of Bushels Under Commodity Futures	0.7
Quantity of Bushels under Forward Purchase Contract	5.3	0.7
Debt Instrument, Collateral Amount (in Dollars) \| $	$ 131,000

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

Jan. 31, 2017

Jan. 31, 2016

Commodity Contract [Member]

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

Asset Derivatives, Fair Value

^[1]

$ 45

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]

163

Liability Derivatives, Fair Value

^[2]

$ 136

$ 312

[1]	Commodity futures are included in prepaid expense and other. These contracts are short/sell positions for approximately 0.7 million bushels of corn.
[2]	Forward purchase contracts assets are included in prepaid expenses and other while forward purchase contracts liabilities are included in accrued expenses and other current liabilities. These contracts are for purchases of approximately 5.3 million bushels of corn at January 31, 2017 and 0.7 million bushels of corn at January 31, 2016.

DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Gains or Losses of Derivative Financial Instruments - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Schedule of Gains or Losses of Derivative Financial Instruments [Abstract]
Cost of sales	$ (2,131)	$ (382)

EMPLOYEE BENEFITS (Details) - USD ($)	Jan. 31, 2017	Jan. 31, 2016
EMPLOYEE BENEFITS (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 214,000	$ 136,000
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	525,330

EMPLOYEE BENEFITS (Details) - Schedule of Non-Vested Restricted Stock Award Activity - $ / shares $ / shares in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Schedule of Non-Vested Restricted Stock Award Activity [Abstract]
Non-Vested Shares, Outstanding	3,168
Weighted Average Grant Date Fair Value, Outstanding	$ 200
Weighted Average Vesting Term, Outstanding	2 years	2 years
Non-Vested Shares, Granted	21,502	3,168
Weighted Average Grant Date Fair Value, Granted	$ 1,269	$ 200
Non-Vested Shares, Forfeited
Weighted Average Grant Date Fair Value, Forfeited
Non-Vested Shares, Vested	1,320
Weighted Average Grant Date Fair Value, Vested	$ 83
Non-Vested Shares Outstanding	23,350	3,168
Weighted Average Grant Date Fair Value, Outstanding	$ 1,386	$ 200

EMPLOYEE BENEFITS (Details) - Schedule of Share-based Compensation, Stock Options, Activity shares in Thousands	12 Months Ended
	Jan. 31, 2015 $ / shares shares
Schedule of Share-based Compensation, Stock Options, Activity [Abstract]
Outstanding Shares	84
Outstanding Weighted Average Exercise Price (in Dollars per share) \| $ / shares	$ 12.37
Exercisable Shares
Exercised Shares	(84)
Exercised Weighted Average Exercise Price (in Dollars per share) \| $ / shares	$ 12.37
Canceled or expired shares
Outstanding Shares

COMMITMENTS (Details) lb in Millions, gal in Millions, bu in Millions	12 Months Ended
	Jan. 31, 2017 USD ($) T lb gal bu	Jan. 31, 2016 USD ($) bu	Jan. 31, 2015 USD ($)
COMMITMENTS (Details) [Line Items]
Quantity of Bushels under Forward Purchase Contract (in US Bushels) \| bu	5.3	0.7
Operating Leases, Future Minimum Payments Due	$ 24,654,000
One Earth Energy And Nu Gen Energy [Member]
COMMITMENTS (Details) [Line Items]
Quantity of Bushels under Forward Purchase Contract (in US Bushels) \| bu	7.7
Quantity of Ethanol under Sales Commitment (in US Gallons) \| gal	59.7
Quantity of Distillers Grains Under Sales Commitment (in US Tons) \| T	67,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) \| lb	14.4
Supply Commitment Expected Period Of Delivery	They expect to deliver the ethanol, distillers grains and corn oil through June 2017.
One Earth Energy And Nu Gen Energy [Member] \| Railcars One [Member]
COMMITMENTS (Details) [Line Items]
Operating Leases, Rent Expense, Net	$ 8,515,000	$ 7,221,000	$ 7,024,000
Lease Expiration Date	Feb. 01, 2024
One Earth Energy And Nu Gen Energy [Member] \| Distillers Grains Marketing Services [Member]
COMMITMENTS (Details) [Line Items]
Marketing Expense	$ 1,194,000	$ 1,169,000	$ 1,190,000
One Earth Energy [Member]
COMMITMENTS (Details) [Line Items]
Expiration Date of Grain Agreement	Oct. 31, 2016
Maximum Period to Notify Other Party for Grain Agreement Period Extension	180 months
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
Alliance Grain [Member]
COMMITMENTS (Details) [Line Items]
Percentage of Grain Purchase Under Agreement	100.00%

INCOME TAXES (Details) - USD ($)	12 Months Ended
INCOME TAXES (Details) - USD ($)	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 417,000	$ 1,151,000	$ 1,752,000	$ 2,017,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(734,000)	(601,000)	(265,000)
Income Taxes Paid	7,090,000	20,253,000	30,142,000
Proceeds from Income Tax Refunds	150,000	132,000	53,000
Unrecognized Tax Benefits	1,875,000	$ 987,000	$ 1,658,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	221,000
Increase in Unrecognized Tax Benefits is Reasonably Possible	$ 1,297,000

INCOME TAXES (Details) - Schedule of Components of Income Tax Expense - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Federal:
Current	$ 12,197	$ 15,804	$ 23,452
Deferred	3,568	(2,867)	20,717
	15,765	12,937	44,169
State and Local:
Current	2,153	2,651	3,536
Deferred	(525)	(1,480)	1,944
	1,628	1,171	5,480
Provision for income taxes	$ 17,393	$ 14,108	$ 49,649

INCOME TAXES (Details) - Schedule of Deferred Tax Assets and Liabilities - USD ($)	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Assets:
Accrued liabilities	$ 539,000	$ 915,000
State net operating loss carryforward	412,000	1,147,000
Other items	513,000	198,000
Valuation allowance	(417,000)	(1,151,000)	$ (1,752,000)	$ (2,017,000)
Total	1,047,000	1,109,000
Liabilities:
Basis in pass through entities, including depreciation	(41,080,000)	(37,834,000)
Other	(278,000)	(543,000)
Total	(41,358,000)	(38,377,000)
Net deferred tax liability	$ (40,311,000)	$ (37,268,000)

INCOME TAXES (Details) - Schedule of Effective Income Tax Reconciliation	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Schedule of Effective Income Tax Reconciliation [Abstract]
Federal income tax at statutory rate	35.00%	35.00%	35.00%
State and local taxes, net of federal tax benefit	2.30%	(1.30%)	3.60%
Net change in valuation allowance		(1.20%)	(0.20%)
Domestic production activities deduction	(2.90%)	(1.70%)	(1.10%)
Uncertain tax positions	0.80%	1.00%
Noncontrolling interest	(4.60%)	(4.40%)	(4.00%)
Other			(0.80%)
Total	30.60%	27.40%	32.50%

INCOME TAXES (Details) - Schedule of Unrecognized Tax Benefits Roll Forward - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Schedule of Unrecognized Tax Benefits Roll Forward [Abstract]
Unrecognized tax benefits, beginning of year	$ 987	$ 1,658
Changes for tax positions for prior years	1,109
Changes for tax positions for prior years		(1,658)
Changes for tax positions for current year		987
Unrecognized tax benefits, end of year	$ 2,096	$ 987

DISCONTINUED OPERATIONS (Details) - Schedule of Disposal Groups Including Discontinued Operations $ in Thousands	12 Months Ended
	Jan. 31, 2015 USD ($)
Schedule of Disposal Groups Including Discontinued Operations [Abstract]
Net sales and revenue	$ 47
Cost of sales	(321)
Income before income taxes	368
Provision for income taxes	(134)
Income from discontinued operations, net of tax	234
Gain on disposal before provision for income taxes	513
Provision for income taxes	(186)
Gain on disposal of discontinued operations, net of tax	$ 327

- Definition

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

- Definition

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

CONTINGENCIES (Details) - USD ($)	Jan. 31, 2017	Jan. 31, 2016
Loss Contingency [Abstract]
Loss Contingency Accrual	$ 0	$ 0

NET SALES AND REVENUE (Details) - Schedule of Sales of Consolidated Ethanol Plants - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Revenue from External Customer [Line Items]
Product or Service	$ 453,799	$ 436,488	$ 572,230
Ethanol [Member]
Revenue from External Customer [Line Items]
Product or Service	358,349	333,200	452,831
Dried Distillers Grains [Member]
Revenue from External Customer [Line Items]
Product or Service	71,204	81,116	96,328
Non-Food Grade Corn Oil [Member]
Revenue from External Customer [Line Items]
Product or Service	18,518	15,510	16,985
Modified Distillers Grains [Member]
Revenue from External Customer [Line Items]
Product or Service	5,326	5,999	4,814
Other Product [Member]
Revenue from External Customer [Line Items]
Product or Service	$ 402	$ 663	$ 1,272

QUARTERLY UNAUDITED INFORMATION (Details) - Schedule of Quarterly Financial Information - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Jan. 31, 2017

Oct. 31, 2016

Jul. 31, 2016

Apr. 30, 2016

Jan. 31, 2016

Oct. 31, 2015

Jul. 31, 2015

Apr. 30, 2015

Jan. 31, 2017

Jan. 31, 2016

Jan. 31, 2015

Schedule of Quarterly Financial Information [Abstract]

Net sales and revenue

$ 121,587

$ 116,283

$ 115,707

$ 100,222

$ 107,227

$ 110,584

$ 113,480

$ 105,197

$ 453,799

$ 436,488

$ 572,230

Gross profit

25,171

20,162

17,284

8,422

9,158

14,273

18,276

9,127

71,039

50,834

141,939

Net income

15,549

11,474

9,029

3,466

4,827

9,433

18,711

4,439

39,518

37,410

103,714

Net income attributable to REX common shareholders

$ 12,381

$ 8,938

$ 8,176

$ 2,838

$ 3,686

$ 7,456

$ 16,367

$ 3,927

$ 32,333

$ 31,436

$ 87,337

Basic net income per share attributable to REX common shareholders (in Dollars per share)

$ 1.88

$ 1.36

$ 1.24

$ 0.43

$ 0.54

^[1]

$ 1.08

^[1]

$ 2.16

^[1]

$ 0.50

^[1]

$ 4.91

$ 4.31

$ 10.77

Diluted net income per share attributable to REX common shareholders (in Dollars per share)

$ 1.88

$ 1.36

$ 1.24

$ 0.43

$ 0.54

^[1]

$ 1.08

^[1]

$ 2.16

^[1]

$ 0.50

^[1]

$ 4.91

$ 4.30

$ 10.76

[1]	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 (Details) - USD ($) $ in Millions	12 Months Ended
RELATED PARTIES (Details) - USD ($) $ in Millions	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
RELATED PARTIES (Details) [Line Items]
Accounts Payable, Related Parties, Current	$ 1.7	$ 1.2
One Earth Energy And Nu Gen Energy [Member]
RELATED PARTIES (Details) [Line Items]
Costs and Expenses, Related Party	$ 148.5	$ 148.2	$ 164.7

Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - VALUATION AND QUALIFYING ACCOUNTS - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
2017:
Balance	$ 1,151,000	$ 1,752,000	$ 2,017,000
Deductions Charges for Which Reserves Were Created	734,000	601,000	265,000
Balance	$ 417,000	$ 1,151,000	$ 1,752,000