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Net Income Per Share (Tables)
 9 Months Ended
Dec. 31, 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
December 31,		     Nine Months Ended
December 31,		  
    2015     2014     2015     2014  
Net income (numerator):                                
Net income   $ 4,890     $ 4,797     $ 15,149     $ 12,502  
Shares (denominator):                                
Weighted average number of common shares outstanding used in basic computation     20,145       20,038       20,115       20,005  
Common shares issuable upon vesting of restricted stock     96       114       107       118  
Common shares issuable upon conversion of preferred shares     10       10       10       10  
Shares used in diluted computation     20,251       20,162       20,232       20,133  
Net income per common share:                                
Basic   $ 0.24     $ 0.24     $ 0.75     $ 0.62  
Diluted   $ 0.24     $ 0.24     $ 0.75     $ 0.62