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Note 12 - Computation of Earnings Per Share (Tables)
 3 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months Ended
 
 
 
June 30,
 
 
 
2017
 
 
2016
 
 
 
(unaudited)
 
Net income
   $
5,494
     $
3,019
  
Weighted average shares - basic
    
32,086
      
31,401
  
Weighted average shares - diluted
    
33,044
      
32,001
  
Net income per share - basic
   $
0.17
     $
0.10
  
Net income per share - diluted
   $
0.17
     $
0.09