Note 6 - Income Taxes (Details Textual) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Nov. 26, 2017	Nov. 27, 2016	Nov. 26, 2017	Nov. 27, 2016	May 28, 2017
Income Tax Expense (Benefit)	$ 207,000	$ 693,000	$ 1,458,000	$ 2,582,000
Effective Income Tax Rate Reconciliation, Percent			36.00%	34.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%		35.00%
Unrecognized Tax Benefits	535,000		$ 535,000		$ 537,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 433,000		$ 433,000		$ 419,000
Domestic Tax Authority [Member] \| Earliest Tax Year [Member]
Open Tax Year			2013
State and Local Jurisdiction [Member] \| Earliest Tax Year [Member]
Open Tax Year			2012

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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