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Note 6 - Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2016 | Mar. 01, 2015 | Feb. 28, 2016 | Mar. 01, 2015 | May. 31, 2015
Green Line [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  |  | $ (12,500,000) |  |
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 |  |
Effective Income Tax Rate Reconciliation, Percent |  |  | 37.00% | 36.00% |
Income Tax Expense (Benefit) | $ (12,510,000) | $ 2,324,000 | $ (9,750,000) | $ 5,409,000 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 35.00% |  |
Unrecognized Tax Benefits | 860,000 |  | $ 860,000 |  | $ 1,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 727,000 |  | $ 727,000 |  | $ 800,000

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