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Note 5 - Income Taxes (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2014	Nov. 24, 2013	Nov. 30, 2014	Nov. 24, 2013	May 25, 2014
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 1,785,000us-gaap_IncomeTaxExpenseBenefit	$ 1,874,000us-gaap_IncomeTaxExpenseBenefit	$ 3,086,000us-gaap_IncomeTaxExpenseBenefit	$ 4,349,000us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent			36.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Unrecognized Tax Benefits	945,000us-gaap_UnrecognizedTaxBenefits		945,000us-gaap_UnrecognizedTaxBenefits		1,000,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 759,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate		$ 759,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate		$ 807,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Domestic Tax Authority [Member] | Earliest Tax Year [Member]
Income Tax Disclosure [Abstract]
Open Tax Year			1997
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Income Tax Disclosure [Abstract]
Open Tax Year			1998

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

-Section 08

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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- Definition

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

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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

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