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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) | $ 1,785,000 us-gaap_IncomeTaxExpenseBenefit | $ 1,874,000 us-gaap_IncomeTaxExpenseBenefit | $ 3,086,000 us-gaap_IncomeTaxExpenseBenefit | $ 4,349,000 us-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 | 945,000 us-gaap_UnrecognizedTaxBenefits |  | 945,000 us-gaap_UnrecognizedTaxBenefits |  | 1,000,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 759,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  | $ 759,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  | $ 807,000 us-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 |  |

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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