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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Net income (numerator):    
Net income $ 3,952 $ 4,837
Shares (denominator):    
Weighted average number of common shares outstanding used in basic computation 20,119 21,648
Common shares issuable upon vesting of restricted stock 116 109
Common shares issuable upon conversion of preferred shares 10 10
Shares used in diluted computation 20,245 21,767
Net income per common share:    
Basic $ 0.20 $ 0.22
Diluted $ 0.20 $ 0.22