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Accounting Policies (Tables)
 6 Months Ended
Jul. 31, 2023
Accounting Policies [Abstract]  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] The following tables show the effect of the retrospective change to the Consolidated Statements of Operations previously presented:
   Three Months Ended
April 30, 2023
    
   As Previously
Reported		  Effect of
Change		  As Currently
Reported
Cost of sales  $197,685  $4,863  $202,548
          
Gross profit  $15,029  $(4,863)  $10,166
          
Selling, general and administrative  $(10,632)  $4,863  $(5,769)
   Three Months Ended
July 31, 2022
    
   As Previously
Reported		  Effect of
Change		  As Currently
Reported
Cost of sales  $223,744  $2,481  $226,225
          
Gross profit  $16,584  $(2,481)  $14,103
          
Selling, general and administrative  $(9,148)  $2,481  $(6,667)
   Six Months Ended
July 31, 2022
    
   As Previously
Reported		  Effect of
Change		  As Currently
Reported
Cost of sales  $406,060  $2,485  $408,545
          
Gross profit  $28,496  $(2,485)  $26,011
          
Selling, general and administrative  $(14,351)  $2,485  $(11,866)
Schedule of Inventory, Current [Table Text Block] The components of inventory are as follows as of the dates presented (amounts in thousands):
   July 31,
2023		   January 31,
2023		 
Ethanol and other finished goods  $7,072   $12,695 
Work in process   7,297    10,194 
Corn and other raw materials   31,591    25,855 
Total  $45,960   $48,744