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Fair Value (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Fair Value (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment in cooperative $ 333rex_InvestmentInCooperativeFairValueDisclosure [1] $ 333rex_InvestmentInCooperativeFairValueDisclosure [1]
Fair Value, Inputs, Level 1 [Member]    
Fair Value (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment in cooperative    [1]    [1]
Fair Value, Inputs, Level 2 [Member]    
Fair Value (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment in cooperative    [1]    [1]
Fair Value, Inputs, Level 3 [Member]    
Fair Value (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment in cooperative $ 333rex_InvestmentInCooperativeFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1] $ 333rex_InvestmentInCooperativeFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]
[1] The investment in cooperative is included in "Other assets" on the accompanying Consolidated Condensed Balance Sheets.