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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 6 Months Ended
Nov. 29, 2015
Nov. 30, 2014
Nov. 29, 2015
Nov. 30, 2014
Revenue Recorded Upon Shipment [Member]        
Revenue $ 112,709 $ 109,764 $ 223,125 $ 216,004
Revenue Recorded Upon Acceptance in Foreign Port [Member]        
Revenue 22,140 22,106 44,484 48,693
Revenue from Multiple Element Arrangements [Member]        
Revenue 1,534 423 2,540 635
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member]        
Revenue 4,058 372 5,647 947
Revenue $ 140,441 $ 132,665 $ 275,796 $ 266,279