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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. 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

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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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