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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Details) - Revenue Arrangements (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Aug. 31, 2014 | Aug. 25, 2013
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Revenue | $ 133,614 | $ 109,479
Revenue Recorded Upon Shipment [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Revenue | 106,240 | 87,410
Revenue Recorded Upon Acceptance in Foreign Port [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Revenue | 26,587 | 21,389
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Revenue | 212 | 58
Revenue from Multiple Element Arrangements [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Revenue | $ 575 | $ 622

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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=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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