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Net Sales and Revenue (Tables)
 9 Months Ended
Oct. 31, 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   Nine Months Ended 
   October 31,   October 31, 
Product or Service Category  2016   2015   2016   2015 
Ethanol  $90,702   $82,767   $259,266   $248,329 
Dried distillers grains   19,551    22,518    55,551    64,354 
Non-food grade corn oil   5,074    3,994    13,658    12,002 
Modified distillers grains   853    1,108    3,400    4,109 
Other   103    197    337    467 
Total  $116,283   $110,584   $332,212   $329,261