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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
	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

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