Note 11 Employee Equity Incentive Plans (Weighted Average Estimates and Assumptions) (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012 Y	Sep. 30, 2011 Y	Sep. 30, 2012 Y		Sep. 30, 2011 Y
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	$ 5.01	$ 6.22	$ 5.21		$ 6.44
Risk-free Interest Rate	1.00%	1.10%	1.00%		1.40%
Expected Term in Years	6.34	5.72	6.34		5.82
Volatility	55.50%	55.40%	55.40%		55.50%
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			$ 3.67	[1]	$ 2.51	[1]
Risk-free Interest Rate			0.10%	[1]	0.20%	[1]
Expected Term in Years			0.5	[1]	0.5	[1]
Volatility			46.80%	[1]	44.90%	[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.