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Note 3 - Net Income Per Share (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
 
   
2019
   
2018
 
                 
Net income (numerator):
               
                 
Net income
  $
5,343
    $
12,582
 
                 
Shares (denominator):
               
                 
Weighted average number of common shares outstanding used in basic computation
   
20,235
     
20,408
 
Common shares issuable upon vesting of restricted stock
   
-
     
31
 
Common shares issuable upon conversion of preferred shares
   
10
     
10
 
Shares used in diluted computation
   
20,245
     
20,449
 
                 
Net income per common share:
               
                 
Basic
  $
0.26
    $
0.62
 
Diluted
  $
0.26
    $
0.62