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Note 5 - Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 27, 2016 | Nov. 29, 2015 | Nov. 27, 2016 | Nov. 29, 2015 | May 29, 2016
Income Tax Expense (Benefit) | $ 693,000 | $ 1,069,000 | $ 2,582,000 | $ 2,760,000 |
Effective Income Tax Rate Reconciliation, Percent | 34.00% |  | 36.00% |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  | 35.00% |  |
Unrecognized Tax Benefits | $ 904,000 |  | $ 904,000 |  | $ 842,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 764,000 |  | 764,000 |  | $ 715,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 300,000 |  | 300,000 |  |
Excess Tax Deficiencies from Share-based Compensation |  |  | $ 59,000 |  |
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 |  |

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