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Note 10 - Stockholders' Equity (Tables)
 3 Months Ended
May 31, 2021
Notes Tables  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   
Three Months Ended
  
   
May 31,
  
   
2021
    
2020
  
Outstanding non-vested restricted stock units as of February 28 or 29:
    
209,450
      
265,555
  
Granted
    
-
      
-
  
Vested
    
(37,702
 )    
(41,131
 )
Cancelled/forfeited
    
(900
 )    
-
  
Outstanding non-vested restricted stock units as of May 31:
    
170,848
      
224,424
  
                 
Weighted average grant date fair value
   $
9.40
     $
9.39
  
Weighted average remaining vesting period (in years)
    
3.41
      
4.33