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. 26, 2017	Nov. 27, 2016	Nov. 26, 2017	Nov. 27, 2016
Product sales	$ 136,457	$ 135,865	$ 259,814	$ 268,259
Revenue Recorded Upon Shipment [Member]
Product sales	118,634	107,987	231,908	214,152
Revenue Recorded Upon Acceptance in Foreign Port [Member]
Product sales	13,996	25,701	21,572	49,040
Revenue from Multiple Element Arrangements [Member]
Product sales	2,132	1,683	3,701	3,268
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member]
Product sales	$ 1,695	$ 494	$ 2,633	$ 1,799