Note 8 - Employee Post-employment Benefits - Changes in the Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Jun. 06, 2017 |
May 31, 2016 |
|
| Pension Plan [Member] | ||
| Beginning of year | $ (16,821) | $ (17,149) |
| Net actuarial (loss)/gain | 367 | (1,891) |
| Amortization of prior service credit | 1 | |
| Amortization of actuarial loss | 1,542 | 2,218 |
| End of year | (14,912) | (16,821) |
| Postretirement Medical and Life Benefits [Member] | ||
| Beginning of year | (491) | (994) |
| Net actuarial (loss)/gain | 147 | 373 |
| Amortization of prior service credit | ||
| Amortization of actuarial loss | 71 | 130 |
| End of year | $ (273) | $ (491) |