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NET SALES AND REVENUE (Tables)
6 Months Ended
Jul. 31, 2017
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
July 31,
   Six Months Ended
July 31,
 
Product or Service Category  2017   2016   2017   2016 
                 
Ethanol  $88,785   $90,933   $180,257   $168,564 
Dried distillers grains   13,472    18,946    28,622    36,000 
Non-food grade corn oil   4,726    4,738    9,318    8,584 
Modified distillers grains   1,748    983    3,667    2,547 
Other   13    107    23    234 
Total  $108,744   $115,707   $221,887   $215,929