Note 11 Computation of Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Net Income	$ 7,648	$ 30,306	$ 36,647
Weighted Average Shares - Basic	31,025	31,344	31,235
Weighted Average Shares - Diluted	31,695	32,496	32,008
Net Income Per Share - Basic	$ 0.25	$ 0.97	$ 1.17
Net Income Per Share - Diluted	$ 0.24	$ 0.93	$ 1.14