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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 9 Months Ended
Feb. 26, 2017
Feb. 28, 2016
Feb. 26, 2017
Feb. 28, 2016
Product sales $ 136,568 $ 129,990 $ 404,827 $ 405,786
Revenue Recorded Upon Shipment [Member]        
Product sales 125,765 118,789 339,917 341,914
Revenue Recorded Upon Acceptance in Foreign Port [Member]        
Product sales 7,276 6,389 56,316 50,873
Revenue from Multiple Element Arrangements [Member]        
Product sales 2,624 4,025 5,892 9,672
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member]        
Product sales $ 903 $ 787 $ 2,702 $ 3,327