Note 4 - Balance Sheet Details (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Mar. 27, 2016	Mar. 29, 2015	Mar. 30, 2014
Property, Plant and Equipment, Net [Member]
Depreciation, Depletion and Amortization	$ 6,600	$ 6,300	$ 5,600
2016 Restructuring Charges and Exit Costs [Member]
Asset Impairment Charges	600
Depreciation, Depletion and Amortization	19,431	18,424	12,947
Asset Impairment Charges	1,807	$ 13,367	$ 2,224
Net Book Value of Asset Written off	$ 300

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration