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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Revenue Arrangements (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 28, 2016
Aug. 30, 2015
Revenue Recorded Upon Shipment [Member]    
Product sales $ 105,588 $ 110,416
Revenue Recorded Upon Acceptance in Foreign Port [Member]    
Product sales 23,339 22,344
Revenue from Multiple Element Arrangements [Member]    
Product sales 1,585 1,589
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member]    
Product sales 1,882 1,006
Product sales $ 132,394 $ 135,355