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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
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Aug. 27, 2017 | Aug. 28, 2016
Product sales | $ 123,357 | $ 132,394
Revenue Recorded Upon Shipment [Member] |  |
Product sales | 113,121 | 105,588
Revenue Recorded Upon Acceptance in Foreign Port [Member] |  |
Product sales | 7,576 | 23,339
Revenue from Multiple Element Arrangements [Member] |  |
Product sales | 1,746 | 1,585
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member] |  |
Product sales | $ 914 | $ 1,882

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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