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Note 4 - Fair Value Measurements (Tables)
 12 Months Ended
Jan. 31, 2021
Notes Tables  
Schedule of Derivative Assets at Fair Value [Table Text Block]
      Fair Value of Derivatives Designated as Hedge Instruments       Fair Value of Derivatives Not Designated As Hedge Instruments       Fair Value  
Derivative assets:                        
Equity contracts    
-
      
8,001
      
8,001
  
      Fair Value of Derivatives Designated as Hedge Instruments       Fair Value of Derivatives Not Designated As Hedge Instruments       Fair Value  
Derivative assets:                        
Equity contracts    
-
      
5,656
      
5,656