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Note 6 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 25, 2018	Feb. 26, 2017	Feb. 25, 2018	Feb. 26, 2017	May 26, 2019	May 27, 2018	May 28, 2017
Effective Income Tax Rate Reconciliation, Percent			(154.00%)	36.00%
Income Tax Expense (Benefit)	$ (12,909,000)	$ 1,556,000	$ (11,451,000)	$ 4,138,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			(13,900,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent							35.00%
Unrecognized Tax Benefits	472,000		472,000				$ 537,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 366,000		$ 366,000				$ 419,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%	29.00%

X

- Definition

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

+ References

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

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Amount of unrecognized tax benefits.

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