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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net income (numerator):        
Net income $ 4,034 $ 3,930 $ 7,986 $ 8,767
Shares (denominator):        
Weighted average number of common shares outstanding used in basic computation 19,962 20,642 20,040 21,142
Common shares issuable upon the vesting of restricted stock 90 58 104 86
Common shares issuable upon conversion of preferred shares 10 10 10 10
Shares used in diluted computation 20,062 20,710 20,154 21,238
Net income per common share:        
Basic (in dollars per share) $ 0.20 $ 0.19 $ 0.40 $ 0.41
Diluted (in dollars per share) $ 0.20 $ 0.19 $ 0.40 $ 0.41