Note 6 - Purchased Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 03, 2016	Mar. 27, 2016
Technology-Based Intangible Assets [Member]
Amortized intangible assets:
Carrying Amount	$ 53,878	$ 53,878
Accumulated Amortization	(44,097)	(43,502)
Net Carrying Amount	$ 9,781	$ 10,376
Weighted Average Life	4 years 109 days	4 years 219 days
Customer Relationships [Member]
Amortized intangible assets:
Carrying Amount	$ 5,225	$ 5,225
Accumulated Amortization	(3,994)	(3,890)
Net Carrying Amount	$ 1,231	$ 1,335
Weighted Average Life	3 years 146 days	3 years 219 days
Distribution Rights [Member]
Amortized intangible assets:
Carrying Amount	$ 1,264	$ 1,264
Accumulated Amortization	(1,264)	(1,261)
Net Carrying Amount		3
Patents [Member]
Amortized intangible assets:
Carrying Amount	3,459	3,459
Accumulated Amortization	(3,459)	(3,459)
Net Carrying Amount
Trade Names [Member]
Amortized intangible assets:
Carrying Amount	210	210
Accumulated Amortization	(210)	(189)
Net Carrying Amount		21
Carrying Amount	64,036	64,036
Accumulated Amortization	(53,024)	(52,301)
Net Carrying Amount	$ 11,012	$ 11,735