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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 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Net income (numerator):        
Net income $ 4,541 $ 4,577 $ 13,446 $ 12,563
Shares (denominator):        
Weighted average number of common shares outstanding used in basic computation 19,925 19,808 19,892 19,963
Common shares issuable upon the vesting of restricted stock 144 105 140 104
Common shares issuable upon conversion of preferred shares 10 10 10 10
Shares used in diluted computation 20,079 19,923 20,042 20,077
Net income per common share:        
Basic (in dollars per share) $ 0.23 $ 0.23 $ 0.68 $ 0.63
Diluted (in dollars per share) $ 0.23 $ 0.23 $ 0.67 $ 0.63