Note 11 Employee Equity Incentive Plans (Fair Value and Assumptions) (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions and Methodology [Line Items]
Weighted Average Estimated Fair Value of Grant Per Share	$ 5.54	$ 4.95	$ 5.54		$ 4.95
Risk-free Interest Rate	1.80%	1.90%	1.80%		1.90%
Expected Term in Years	6 years 3 months	6 years 0 months 25 days	6 years 3 months		6 years 0 months 25 days
Volatility	52.20%	55.50%	52.20%		55.50%
Dividend Yield	1.00%	0.00%	1.00%		0.00%
Amended and Restated 1999 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions and Methodology [Line Items]
Weighted Average Estimated Fair Value of Grant Per Share			$ 2.90	[1]	$ 2.60	[1]
Risk-free Interest Rate			0.10%	[1]	0.10%	[1]
Expected Term in Years			0 years 6 months 0 days	[1]	0 years 6 months 0 days	[1]
Volatility			34.50%	[1]	38.50%	[1]
Dividend Yield			1.06%	[1]	0.00%	[1]

[1] Under the stock purchase plan, rights to purchase shares are only granted during the first and third quarters of each fiscal year.