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Net Sales and Revenue (Tables)
3 Months Ended
Apr. 30, 2016
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  
    April 30,  
Product or Service Category   2016     2015  
Ethanol   $ 77,631     $ 78,572  
Dried distillers grains     17,054       20,251  
Non-food grade corn oil     3,846       3,959  
Modified distillers grains     1,564       2,305  
Other     127       110  
Total   $ 100,222     $ 105,197