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Note 3 - Net Income Per Share (Tables)
9 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
December 31,
   
Nine Months Ended
December 31,
 
   
2018
   
2017
   
2018
   
2017
 
Net income (numerator):
                               
Net income
  $
7,787
    $
9,064
    $
31,121
    $
27,100
 
Shares (denominator):
                               
Weighted average number of common shares outstanding used in basic computation
   
20,483
     
20,368
     
20,452
     
20,337
 
Common shares issuable upon vesting of restricted stock
   
-
     
47
     
25
     
90
 
Common shares issuable upon conversion of preferred shares
   
10
     
10
     
10
     
10
 
Shares used in diluted computation
   
20,493
     
20,425
     
20,487
     
20,437
 
Net income per common share:
                               
Basic
  $
0.38
    $
0.45
    $
1.52
    $
1.33
 
Diluted
  $
0.38
    $
0.44
    $
1.52
    $
1.33