Weighted Average Shares and Net Income Per Share (Details) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Calculations of the basic and diluted weighted shares
Net Income	$ 8,609,000	$ 6,596,000
Basic:
Weighted average common shares outstanding, Basic	21,396,000	22,626,000
Net Income per share, Basic	$ 0.40	$ 0.29
Diluted:
Weighted average common shares outstanding	21,396,000	22,626,000
Treasury stock impact of stock options	188,000	226,000
Total common and common equivalent shares	21,584,000	22,852,000
Net Income per share, Diluted	$ 0.40	$ 0.29