XML 17 R34.htm IDEA: XBRL DOCUMENT v3.20.1
Note 4 - Fair Value Measurements (Tables)
 12 Months Ended
Jan. 31, 2020
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    
–
      
5,656
      
5,656
  
     
Fair Value of Derivatives Designated as Hedge Instruments
      
Fair Value of Derivatives Not Designated As Hedge Instruments
      
Fair Value
  
Derivative assets:                        
Equity contracts    
–
      
2,794
      
2,794