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Net Sales and Revenue (Tables)
6 Months Ended
Jul. 31, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block] The following tables shows disaggregated revenue by product (amounts in thousands):
   Three Months Ended   Six Months Ended 
   July 31,   July 31, 
   2023   2022   2023   2022 
Sales of products                
Ethanol  $167,360   $190,807   $324,908   $337,269 
Dried distillers grains   31,943    34,261    71,649    66,158 
Distillers corn oil   11,419    14,223    24,500    25,325 
Modified distillers grains   1,090    2,456    2,656    6,811 
Derivative financial instrument gains (losses)   130    (1,474)    860    (1,152) 
Other   35    55    118    145 
Total  $211,977   $240,328   $424,691   $434,556