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Net Income Per Share (Tables)
9 Months Ended
Dec. 31, 2016
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,
 
    2016     2015     2016     2015  
Net income (numerator):                                
Net income   $ 4,823     $ 4,890     $ 16,316     $ 15,149  
Shares (denominator):                                
Weighted average number of common shares outstanding used in basic computation     20,253       20,145       20,223       20,115  
Common shares issuable upon vesting of restricted stock     145       96       140       107  
Common shares issuable upon conversion of preferred shares     10       10       10       10  
Shares used in diluted computation     20,408       20,251       20,373       20,232  
Net income per common share:                                
Basic   $ 0.24     $ 0.24     $ 0.81     $ 0.75  
Diluted   $ 0.24     $ 0.24     $ 0.80     $ 0.75