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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 | 12 Months Ended
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May 25, 2014 | Feb. 23, 2014 | Nov. 24, 2013 | Aug. 25, 2013 | May 26, 2013 | Feb. 24, 2013 | Nov. 25, 2012 | Aug. 26, 2012 | May 27, 2012 | Feb. 26, 2012 | Nov. 27, 2011 | Aug. 28, 2011 | May 25, 2014 | May 26, 2013 | May 27, 2012
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 120,929 | $ 126,379 | $ 120,026 | $ 109,479 | $ 107,113 | $ 117,867 | $ 114,654 | $ 102,074 | $ 82,617 | $ 80,064 | $ 81,570 | $ 73,301 | $ 476,813 | $ 441,708 | $ 317,552
Revenue Recorded Upon Shipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 398,938 | 359,518 |
Revenue Recorded Upon Acceptance in Foreign Port [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 69,710 | 78,442 |
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 1,354 | 1,975 |
Revenue from Multiple Element Arrangements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,811 | $ 1,773 |

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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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