Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Revenue Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015
Product sales	$ 135,865	$ 140,441	$ 268,259	$ 275,796
Revenue Recorded Upon Shipment [Member]
Product sales	107,987	112,709	214,152	223,125
Revenue Recorded Upon Acceptance in Foreign Port [Member]
Product sales	25,701	22,140	49,040	44,484
Revenue from Multiple Element Arrangements [Member]
Product sales	1,683	4,058	3,268	5,647
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member]
Product sales	$ 494	$ 1,534	$ 1,799	$ 2,540