Note 9 Employee Equity Incentive Plans (Fair Value and Assumptions) (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock Options [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	$ 5.26	$ 6.42	$ 4.79
Risk-free Interest Rate	1.10%	1.30%	2.00%
Expected Term in Years	6 years 4 months 2 days	5 years 10 months 6 days	5 years 9 months 29 days
Volatility	55.30%	55.70%	56.10%
Dividend Yield	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	$ 3.22	$ 3.14	$ 2.85
Risk-free Interest Rate	0.20%	0.20%	0.30%
Expected Term in Years	0 years 6 months 0 days	0 years 6 months 0 days	0 years 6 months 0 days
Volatility	46.40%	51.60%	49.30%
Dividend Yield	0.00%	0.00%	0.00%