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Note 12 - Quarterly Consolidated Financial Information (Unaudited) - Restatement of Quarterly Cash Flows Disclosure (Details) - USD ($)	3 Months Ended						12 Months Ended
	Feb. 25, 2018	Nov. 26, 2017	Aug. 27, 2017	Feb. 26, 2017	Nov. 27, 2016	Aug. 28, 2016	May 27, 2018	May 28, 2017	May 29, 2016
Net Cash Provided by (Used in) Operating Activities, Total	$ 20,300,000	$ 6,336,000	$ 3,450,000	$ 26,626,000	$ 9,712,000	$ 9,969,000	$ 19,779,000	$ 29,738,000	$ 20,762,000
Net Cash Provided by (Used in) Investing Activities, Total	(22,746,000)	(11,463,000)	(6,869,000)	(12,859,000)	(8,909,000)	(5,624,000)	$ (35,589,000)	(25,422,000)	(40,418,000)
Previously Reported [Member]
Net Cash Provided by (Used in) Operating Activities, Total	18,098,000	4,330,000	(131,000)	23,181,000	5,527,000	6,467,000
Net Cash Provided by (Used in) Investing Activities, Total	(20,544,000)	(9,457,000)	(3,288,000)	(9,414,000)	(4,724,000)	(2,122,000)
Restatement Adjustment [Member]
Net Cash Provided by (Used in) Operating Activities, Total	2,202,000	2,006,000	3,581,000	3,445,000	4,185,000	3,502,000		411,000	(1,200,000)
Net Cash Provided by (Used in) Investing Activities, Total	$ (2,202,000)	$ (2,006,000)	$ (3,581,000)	$ (3,445,000)	$ (4,185,000)	$ (3,502,000)		$ (411,000)	$ 1,200,000

X

- Definition

Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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