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Note 5 - Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 30, 2015 | Aug. 31, 2014 | Aug. 30, 2015 | May. 31, 2015 | May. 25, 2014
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 |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 36.00% | 36.00% |  |  |
Income Tax Expense (Benefit) | $ 1,691,000 | $ 1,301,000 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 35.00% |  |
Unrecognized Tax Benefits | 864,000 |  | $ 864,000 |  | $ 1,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 720,000 |  | $ 720,000 | $ 800,000 |

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