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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands		Nov. 26, 2017	May 28, 2017
Investment in non-public company		$ 65,800	$ 63,600
Fair Value, Inputs, Level 1 [Member]
Investment in non-public company
Total
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Interest rate swap (1)	[1]
Fair Value, Inputs, Level 2 [Member]
Investment in non-public company
Total		909	688
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Interest rate swap (1)	[1]	909	688
Fair Value, Inputs, Level 3 [Member]
Investment in non-public company		65,800	63,600
Total		65,800	63,600
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Interest rate swap (1)	[1]
[1] Included in Other assets.

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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