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Note 14 - Computation of Earnings Per Share (Tables)
 9 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months Ended
 
 
Nine Months Ended
 
 
 
December 31,
 
 
December 31,
 
 
 
2016
 
 
2015
 
 
2016
 
 
2015
 
 
 
(unaudited)
 
 
(unaudited)
 
Net income
   $
5,100
     $
2,286
     $
12,054
     $
8,544
  
Weighted average shares - basic
    
31,558
      
31,487
      
31,484
      
31,626
  
Weighted average shares - diluted
    
32,209
      
32,343
      
32,119
      
32,483
  
Net income per share - basic
   $
0.16
     $
0.07
     $
0.38
     $
0.27
  
Net income per share - diluted
   $
0.16
     $
0.07
     $
0.38
     $
0.26