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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
Jun. 30, 2013
Jun. 30, 2012
Net income (numerator):    
Net income $ 4,755 $ 3,952
Shares (denominator):    
Weighted average number of common shares outstanding used in basic computation 19,848 20,119
Common shares issuable upon the vesting of restricted stock 146 116
Common shares issuable upon conversion of preferred shares 10 10
Shares used in diluted computation 20,004 20,245
Net income per common share:    
Basic (in dollars per share) $ 0.24 $ 0.20
Diluted (in dollars per share) $ 0.24 $ 0.20