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Net Sales and Revenue (Tables)
 6 Months Ended
Jul. 31, 2015
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):

    Three Months Ended     Six Months Ended  
    July 31,     July 31,  
                   
Product or Service Category   2015     2014     2015     2014  
Ethanol   $ 86,990     $ 118,613     $ 165,562     $ 237,719  
Dried distillers grains     21,585       25,809       41,836       56,838  
Non-food grade corn oil     4,049       4,729       8,008       8,659  
Modified distillers grains     696       791       3,001       2,281  
Other     160       289       270       659  
Total   $ 113,480     $ 150,231     $ 218,677     $ 306,156