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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 |  |

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