Note 17 - Pension and Postretirement Benefits - Weighted Average Actuarial Assumption Used to Determine Net Expense (Details)	12 Months Ended
	May 29, 2022	May 30, 2021	May 31, 2020
Pension Plan [Member]
Long-term rate of return on plan assets	3.87%	3.74%	4.77%
Interest Cost [Member] | Pension Plan [Member]
Discount rate - interest cost	2.29%	2.30%	3.51%
Interest Cost [Member] | Other Postretirement Benefits Plan [Member]
Discount rate - interest cost	1.69%	1.74%	3.09%
Service Cost [Member] | Pension Plan [Member]
Discount rate - interest cost	3.50%	3.35%	4.04%
Service Cost [Member] | Other Postretirement Benefits Plan [Member]
Discount rate - interest cost	3.55%	3.03%	3.47%