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Note 2 - Net Income 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
September 30,
   
Six Months Ended
September 30,
 
   
2017
   
2016
   
2017
   
2016
 
Net income (numerator):
                               
Net income
  $
8,760
    $
4,899
    $
18,036
    $
11,493
 
Shares (denominator):
                               
Weighted average number of common shares
outstanding used in basic computation
   
20,349
     
20,234
     
20,321
     
20,208
 
Common shares issuable upon vesting of
restricted stock
   
78
     
133
     
111
     
137
 
Common shares issuable upon conversion
of preferred shares
   
10
     
10
     
10
     
10
 
Shares used in diluted computation
   
20,437
     
20,377
     
20,442
     
20,355
 
Net income per common share:
                               
Basic
  $
0.43
    $
0.24
    $
0.89
    $
0.57
 
Diluted
  $
0.43
    $
0.24
    $
0.88
    $
0.56