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Derivative Financial Instruments (Tables)
6 Months Ended
Jul. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Assets at Fair Value [Table Text Block] The following table provides information about the fair values of the Company’s derivative financial instruments (that are not accounted for under the “normal purchases and normal sales” scope exemption of ASC 815) and the line items on the Consolidated Condensed Balance Sheets in which the fair values are reflected (in thousands):
   Asset Derivatives
Fair Value
   Liability Derivatives
Fair Value
 
   July 31,
2020
   January 31,
2020
   July 31,
2020
   January 31,
2020
 
                 
Commodity futures (1)  $416   $352   $197   $
-
 
Forward purchase contracts (2)   13    
-
    558    230 
Total  $429   $352   $755   $230