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Note 5 - Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 26, 2017 | Feb. 28, 2016 | Feb. 26, 2017 | Feb. 28, 2016 | May 29, 2016
Income Tax Expense (Benefit) | $ 1,556,000 | $ (12,510,000) | $ 4,138,000 | $ (9,750,000) |
Effective Income Tax Rate Reconciliation, Percent | 31.00% | 34.00% | 34.00% | 37.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% | 35.00% | 35.00% | 35.00% |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  |  |  | $ 12,500,000 |
Unrecognized Tax Benefits | $ 918,000 |  | $ 918,000 |  | $ 842,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 778,000 |  | 778,000 |  | $ 715,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 300,000 |  | 300,000 |  |
Excess Tax Deficiencies from Share-based Compensation |  |  | $ 80,000 |  |
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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