Note 12 Employee Equity Incentive Plans (Fair Value and Assumptions) (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
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	$ 4.95	$ 5.01	$ 4.95		$ 5.21
Risk-free Interest Rate	1.90%	1.00%	1.90%		1.00%
Expected Term in Years	6 years 0 months 25 days	6 years 4 months 2 days	6 years 0 months 25 days		6 years 4 months 2 days
Volatility	55.50%	55.50%	55.50%		55.40%
Dividend Yield	0.00%	0.00%	0.00%		0.00%
Employee Stock Purchase Plan 1999 [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			$ 2.60	[1]	$ 3.67	[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			38.50%	[1]	46.80%	[1]
Dividend Yield			0.00%	[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.