Note 12 - Stock-Based Compensation (Details) - Stock-Based Compensation Expense Related to Stock Options and RSUs (USD $)	3 Months Ended
	Jun. 29, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-Based Compensation Expense	$ 3,127,000	$ 1,087,000
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-Based Compensation Expense	260,000	142,000
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-Based Compensation Expense	812,000	140,000
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-Based Compensation Expense	$ 2,055,000	$ 805,000