Note 13 Computation of Earnings 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
Earnings Per Share [Abstract]
Net Income	$ 2,357	$ 10,947	$ 8,364	$ 20,923
Weighted Average Shares - Basic	31,310	31,383	31,331	31,445
Weighted Average Shares - Diluted	31,975	32,545	32,192	32,669
Net Income Per Share - Basic	$ 0.08	$ 0.35	$ 0.27	$ 0.67
Net Income Per Share - Diluted	$ 0.07	$ 0.34	$ 0.26	$ 0.64