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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 $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net income (numerator):        
Net income $ 4,150 $ 4,034 $ 8,905 $ 7,986
Shares (denominator):        
Weighted average number of common shares outstanding used in basic computation 19,902 19,962 19,875 20,040
Common shares issuable upon the vesting of restricted stock 132 90 139 104
Common shares issuable upon conversion of preferred shares 10 10 10 10
Shares used in diluted computation 20,044 20,062 20,024 20,154
Net income per common share:        
Basic (in dollars per share) $ 0.21 $ 0.20 $ 0.45 $ 0.40
Diluted (in dollars per share) $ 0.21 $ 0.20 $ 0.44 $ 0.40