Note 12 - Fair Value Measurements - Carrying Amounts and Fair Values of Other Financial Instruments Not Measured on a Recurring Basis (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Thousands |
Jun. 06, 2017 |
May 31, 2016 |
|---|---|---|
| Long-term debt, fair value | $ 209,524 | $ 223,212 |
| Long-term debt, carrying amount | $ 213,491 | $ 223,526 |