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Note 9 - Pensions and Other Postretirement Benefits - Assumptions Used (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension Plan [Member]    
Discount rate 4.69% 4.89%
Rate of compensation increase 3.50% 3.50%
Discount rate 4.89% 4.43%
Expected long-term rate of return on plan assets 6.20% 5.00%
Rate of compensation increase 3.50% 3.50%
Postemployment Retirement Benefits [Member]    
Discount rate 4.86% 5.16%
Rate of compensation increase 0.00% 0.00%
Discount rate 5.16% 2.70%
Expected long-term rate of return on plan assets 0.00% 0.00%
Rate of compensation increase 0.00% 0.00%