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Net Income Per Share - Reconciliation of the numerators and denominators of the basic and diluted net income per share computations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Net income (numerator):        
Net income (in dollars) $ 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