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Note 11 - Computation of Earnings Per Share (Tables)
 6 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
   
Six Months Ended
  
   
September 30,
    
September 30,
  
   
2017
    
2016
    
2017
    
2016
  
   
(unaudited)
    
(unaudited)
  
Net income
   $
3,463
     $
3,935
     $
8,957
     $
6,954
  
Weighted average shares - basic
    
32,642
      
31,490
      
32,364
      
31,447
  
Weighted average shares - diluted
    
34,099
      
32,145
      
33,572
      
32,074
  
Net income per share - basic
   $
0.11
     $
0.12
     $
0.28
     $
0.22
  
Net income per share - diluted
   $
0.10
     $
0.12
     $
0.27
     $
0.22