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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
Jun. 30, 2015
Jun. 30, 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 (in dollars per share) $ 0.29 $ 0.25
Diluted (in dollars per share) $ 0.29 $ 0.25