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Note 5 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Aug. 28, 2016	Aug. 30, 2015	May 29, 2016
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
Income Tax Expense (Benefit)	$ 1,889,000	$ 1,691,000
Income Tax Expense (Benefit)	$ 1,889,000	$ 1,691,000
Effective Income Tax Rate Reconciliation, Percent	36.00%	36.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Unrecognized Tax Benefits	$ 904,000		$ 842,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	765,000		$ 715,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible	300,000
Excess Tax Deficiencies from Share-based Compensation	$ 69,000

X

- Definition

Amount of excess tax deficiencies related to stock-based compensation, which is reflected as a component of income tax expense.

+ References

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

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

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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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