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Net Income Per Share (Tables)
 12 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Schedule of reconciliation of the numerators and denominators of the basic and diluted net income per share computations
   
Year Ended March 31,
  
   
2015
    
2014
    
2013
  
                   
Net income (numerator):
                  
Net income
   $ 17,453     $ 17,972     $ 17,165  
                         
Shares (denominator)
                        
Weighted average number of common shares outstanding used in basic computation
     20,015       19,901       19,926  
Common shares issuable upon the vesting of restricted stock
     111       132       113  
Common shares issuable upon conversion of preferred shares
     10       10       10  
Shares used in diluted computation
     20,136       20,043       20,049  
                         
Net income per common share:
                        
Basic
   $ 0.87     $ 0.90     $ 0.86  
Diluted
   $ 0.87     $ 0.90     $ 0.86