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Note 3 - Net Income Per Share (Tables)
6 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
September 30,
   
Six Months Ended
September 30,
 
   
2019
   
2018
   
2019
   
2018
 
Net income (numerator):
                               
Net income
  $
6,665
    $
10,752
    $
12,008
    $
23,334
 
Shares (denominator):
                               
Weighted average number of common shares outstanding used in basic computation
   
19,963
     
20,463
     
20,098
     
20,436
 
Common shares issuable upon vesting of restricted stock
   
-
     
47
     
1
     
39
 
Common shares issuable upon conversion of preferred shares
   
10
     
10
     
10
     
10
 
Shares used in diluted computation
   
19,973
     
20,520
     
20,109
     
20,485
 
Net income per common share:
                               
Basic
  $
0.33
    $
0.53
    $
0.60
    $
1.14
 
Diluted
  $
0.33
    $
0.52
    $
0.60
    $
1.14