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Note 7 - Net Income Per Share (Tables)
12 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended March 31,
 
   
2019
   
2018
   
2017
 
                         
Net income (numerator):
                       
                         
Net income
  $
37,740
    $
37,283
    $
23,819
 
                         
Shares (denominator)
                       
                         
Weighted average number of common shares outstanding used in basic computation
   
20,461
     
20,346
     
20,232
 
Common shares issuable upon the vesting of restricted stock
   
20
     
77
     
136
 
Common shares issuable upon conversion of preferred shares
   
10
     
10
     
10
 
Shares used in diluted computation
   
20,491
     
20,433
     
20,378
 
                         
Net income per common share:
                       
                         
Basic
  $
1.84
    $
1.83
    $
1.18
 
Diluted
  $
1.84
    $
1.82
    $
1.17