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INCOME TAXES (Details) - Schedule of Deferred Tax Assets and Liabilities (USD $) | Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
--- | --- | --- | --- | ---
Assets: |  |  |  |
Accrued liabilities | $ 664,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | $ 331,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |  |
Stock based compensation |  | 185,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |  |
AMT credit carryforward | 4,015,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 19,751,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |  |
Alcohol fuels tax credit |  | 546,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards |  |
State net operating loss carryforward | 1,343,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 2,833,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |  |
Other items | 624,000 us-gaap_DeferredTaxAssetsOther | 396,000 us-gaap_DeferredTaxAssetsOther |  |
Valuation allowance | (1,752,000)us-gaap_DeferredTaxAssetsValuationAllowance | (2,017,000)us-gaap_DeferredTaxAssetsValuationAllowance | (1,891,000)us-gaap_DeferredTaxAssetsValuationAllowance | (1,676,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total | 4,894,000 us-gaap_DeferredTaxAssetsNet | 22,025,000 us-gaap_DeferredTaxAssetsNet |  |
Liabilities: |  |  |  |
Basis in pass through entities, including depreciation | (44,783,000)rex_DeferredTaxLiabilitiesBasisInPassThroughEntitiesIncludingDepreciation | (39,195,000)rex_DeferredTaxLiabilitiesBasisInPassThroughEntitiesIncludingDepreciation |  |
Other | (516,000)us-gaap_DeferredTaxLiabilitiesOther | (297,000)us-gaap_DeferredTaxLiabilitiesOther |  |
Total | (45,299,000)us-gaap_DeferredTaxLiabilities | (39,492,000)us-gaap_DeferredTaxLiabilities |  |
Net deferred tax liability | $ (40,405,000)us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (17,467,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |  |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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