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Note 6 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Aug. 27, 2017	Aug. 28, 2016	May 28, 2017
Deferred Tax Assets, Valuation Allowance	$ 1,300,000	$ 1,900,000
Effective Income Tax Rate Reconciliation, Percent	37.00%	36.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%
Unrecognized Tax Benefits	$ 630,000		$ 537,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	495,000		$ 419,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 215,000
Domestic Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year	1997
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year	1998

X

- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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