Note 8 - Employee Post-employment Benefits - Fair Values of Assets Held by the Retirement Plan by Asset Category (Details) - USD ($)
$ in Thousands |
Jun. 06, 2017 |
May 31, 2016 |
| Fair value of plan assets as of measurement date |
$ 6,126
|
$ 6,209
|
| Total assets reported as of fiscal year end |
6,126
|
6,209
|
| Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Fair value of plan assets as of measurement date |
80
|
249
|
| Total assets reported as of fiscal year end |
80
|
249
|
| Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | US-based Companies [Member] |
|
|
| Fair value of plan assets as of measurement date |
2,677
|
2,561
|
| Total assets reported as of fiscal year end |
2,677
|
2,561
|
| Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | International-based Companies [Member] |
|
|
| Fair value of plan assets as of measurement date |
1,175
|
1,222
|
| Total assets reported as of fiscal year end |
1,175
|
1,222
|
| Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] | As of Measurement Date [Member] |
|
|
| Fair value of plan assets as of measurement date |
1,504
|
1,259
|
| Total assets reported as of fiscal year end |
1,504
|
1,259
|
| Public Real Estate Investment Trusts [Member] | Fair Value, Inputs, Level 1 [Member] | As of Measurement Date [Member] |
|
|
| Fair value of plan assets as of measurement date |
|
315
|
| Total assets reported as of fiscal year end |
|
315
|
| Other Retirement Plan Assets [Member] | Fair Value, Inputs, Level 1 [Member] | As of Measurement Date [Member] |
|
|
| Fair value of plan assets as of measurement date |
690
|
603
|
| Total assets reported as of fiscal year end |
$ 690
|
$ 603
|