Weighted Average Shares and Net Income Per Share (Details) (USD $)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Weighted Average Shares and Net Income Per Share [Abstract]
Net Income	$ 6,596,000	$ 8,198,000
Basic:
Weighted average common shares outstanding	11,313,000	11,617,000
Net Income per share	$ 0.58	$ 0.71
Diluted:
Weighted average common shares outstanding	11,313,000	11,617,000
Treasury stock impact of stock options	113,000	170,000
Total common and common equivalent shares	11,426,000	11,787,000
Effect on diluted net income per share	$ 0.58	$ 0.70