Note 12 - Fair Value Measurements - Fair Values Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands |
Jun. 06, 2017 |
May 31, 2016 |
|---|---|---|
| Assets, Fair Value Disclosure, Nonrecurring | $ 16,979 | $ 58,777 |
| Fair Value, Inputs, Level 2 [Member] | Assets Held for Use [Member] | ||
| Assets, Fair Value Disclosure, Nonrecurring | 13,480 | 56,101 |
| Fair Value, Inputs, Level 2 [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | ||
| Assets, Fair Value Disclosure, Nonrecurring | 3,499 | 2,123 |
| Fair Value, Inputs, Level 3 [Member] | Assets Held for Use [Member] | ||
| Assets, Fair Value Disclosure, Nonrecurring | $ 553 |