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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
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Feb. 25, 2018 | Feb. 26, 2017 | Feb. 25, 2018 | Feb. 26, 2017
Revenue | $ 149,323 | $ 136,568 | $ 409,137 | $ 404,827
Revenue Recorded Upon Shipment [Member] |  |  |  |
Revenue | 141,575 | 125,765 | 373,486 | 339,917
Revenue Recorded Upon Acceptance in Foreign Port [Member] |  |  |  |
Revenue | 4,414 | 7,276 | 25,982 | 56,316
Revenue from Multiple Element Arrangements [Member] |  |  |  |
Revenue | 1,528 | 2,624 | 5,230 | 5,892
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member] |  |  |  |
Revenue | $ 1,806 | $ 903 | $ 4,439 | $ 2,702

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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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