Note 4 - Balance Sheet Details (Details) (USD $)	12 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Mar. 31, 2013
Note 4 - Balance Sheet Details (Details) [Line Items]
Depreciation, Depletion and Amortization	$ 18,424,000	$ 12,947,000	$ 10,809,000
Write-off Of Fully Depreciated Assets	7,500,000
Asset Impairment Charges	13,367,000	2,224,000
Property And Equipment [Member]
Note 4 - Balance Sheet Details (Details) [Line Items]
Depreciation, Depletion and Amortization	6,300,000	5,600,000	6,800,000
2015 Restructuring [Member]
Note 4 - Balance Sheet Details (Details) [Line Items]
Asset Impairment Charges	$ 2,000,000