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Note 5 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016	May 29, 2016
Income Tax Expense (Benefit)	$ 1,556,000	$ (12,510,000)	$ 4,138,000	$ (9,750,000)
Effective Income Tax Rate Reconciliation, Percent	31.00%	34.00%	34.00%	37.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount				$ 12,500,000
Unrecognized Tax Benefits	$ 918,000		$ 918,000		$ 842,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	778,000		778,000		$ 715,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 300,000		300,000
Excess Tax Deficiencies from Share-based Compensation			$ 80,000
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

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

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

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