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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
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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

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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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