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Note 4 - Fair Value Measurements (Tables)
 12 Months Ended
Jan. 31, 2018
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    
-
      
1,764
      
1,764