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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 $ 664,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 331,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities    
Stock based compensation   185,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost    
AMT credit carryforward 4,015,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 19,751,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax    
Alcohol fuels tax credit   546,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards    
State net operating loss carryforward 1,343,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 2,833,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
Other items 624,000us-gaap_DeferredTaxAssetsOther 396,000us-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 4,894,000us-gaap_DeferredTaxAssetsNet 22,025,000us-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