Note 8 - Income Taxes (Details Textual) - USD ($)			3 Months Ended	12 Months Ended
		Feb. 27, 2017	Feb. 28, 2016	May 28, 2017	May 29, 2016		May 31, 2015		May 25, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				35.00%
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		$ 0		$ 0	$ 34,000,000	[1]		[1]
Effective Income Tax Rate Reconciliation, Percent				29.00%	39.00%
Excess Tax Deficiencies from Share-based Compensation				$ 192,000
Deferred Tax Assets, Gross				9,751,000	$ 7,696,000
Net Cash Provided by (Used in) Operating Activities, Continuing Operations				29,327,000	21,934,000	[1]	26,618,000	[1]
Net Cash Provided by (Used in) Financing Activities, Continuing Operations				(8,801,000)	15,423,000	[1]	7,706,000	[1]
Deferred Tax Assets, Valuation Allowance				1,325,000	1,240,000
Unrecognized Tax Benefits				537,000	842,000		987,000		$ 1,035,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate				419,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible				215,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards				6,800,000
Domestic Tax Authority [Member] | Indiana [Member]
Operating Loss Carryforwards				5,700,000
Domestic Tax Authority [Member] | Other States, Tax Board [Member]
Operating Loss Carryforwards				$ 3,000,000
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year				1998
State and Local Jurisdiction [Member] | California [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research				$ 1,200,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[2]			423,000
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[2]			200,000
Accounting Standards Update 2016-09 [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations					150,000		463,000
Net Cash Provided by (Used in) Financing Activities, Continuing Operations					(150,000)		$ (463,000)
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					549,000
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member] | Changes In Forfeiture Method [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					(126,000)
Accounting Standards Update 2016-09 [Member] | Additional Paid-in Capital [Member] | Changes In Forfeiture Method [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					200,000
Changes In Forfeiture Method [Member]
Deferred Tax Assets, Gross					$ (74,000)
GreenLine Trademark [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			$ 34,000,000	$ 34,000,000

[1] See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for a discussion of accounting principles adopted during the period.

[2] See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for a discussion of accounting guidance adopted during the period.