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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, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Net income (numerator):        
Net income (in dollars) $ 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 (in dollars per share) $ 0.24 $ 0.24 $ 0.81 $ 0.75
Diluted (in dollars per share) $ 0.24 $ 0.24 $ 0.80 $ 0.75