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COMMITMENTS (Details)
lb in Millions, l in Millions, gal in Millions, bu in Millions
 12 Months Ended
Jan. 31, 2016
USD ($)
T
lb
gal
l
bu
Jan. 31, 2015
USD ($)
Jan. 31, 2014
USD ($)
COMMITMENTS (Details) [Line Items]      
Quantity of Bushels under Forward Purchase Contract (in US Bushels) | l 0.7    
Operating Leases, Future Minimum Payments Due $ 31,048,000    
One Earth Energy And Nu Gen Energy [Member]      
COMMITMENTS (Details) [Line Items]      
Quantity of Bushels under Forward Purchase Contract (in US Bushels) | bu 14.0    
Supply Commitment Expected Period Of Delivery They expect to take delivery of the corn through May 2016.    
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal 51.7    
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T 63,000    
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb 10.5    
Alliance Grain [Member]      
COMMITMENTS (Details) [Line Items]      
Percentage of Grain Purchase Under Agreement 100.00% 100.00% 100.00%
Expiration Date of Grain Agreement Oct. 31, 2016    
Maximum Period to Notify Other Party for Grain Agreement Period Extension 180 months    
Natural Gas Pipeline [Member] | One Earth Energy [Member]      
COMMITMENTS (Details) [Line Items]      
Lease Expiration Period 10 years    
Operating Leases, Future Minimum Payments Due $ 4,380,000    
Number of installments payable 120    
Installment amount $ 36,500    
Operating Leases, Rent Expense, Net 438,000 $ 438,000 $ 438,000
Railcars One [Member] | One Earth Energy And Nu Gen Energy [Member]      
COMMITMENTS (Details) [Line Items]      
Operating Leases, Rent Expense, Net $ 7,221,000 7,024,000 6,405,000
Lease Expiration Date Sep. 30, 2022    
Distillers Grains Marketing Services [Member] | One Earth Energy And Nu Gen Energy [Member]      
COMMITMENTS (Details) [Line Items]      
Marketing Expense $ 1,169,000 $ 1,190,000 $ 1,478,000