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Net Income Per Share (Tables)
 3 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of reconciliation of the numerators and denominators of the basic and diluted net income per share computations
  Three Months Ended June 30,  
    2015     2014  
             
Net income (numerator):            
             
  Net income   $ 5,757     $ 4,973  
                 
Shares (denominator):                
                 
  Weighted average number of common shares                
    outstanding used in basic computation     20,074       19,961  
  Common shares issuable upon vesting of                
    restricted stock     114       121  
  Common shares issuable upon conversion                
    of preferred shares     10       10  
  Shares used in diluted computation     20,198       20,092  
                 
Net income per common share:                
                 
  Basic   $ 0.29     $ 0.25  
  Diluted   $ 0.29     $ 0.25