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Note 12 - Pension and Postretirement Benefit Plans (Details Textual)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Rate
Period of Forecast (Year) 10 years
Minimum [Member]  
Multiemployer Plans, Green Zone, Percentage (Rate) 80.00%
Multiemployer Plans, Yellow Zone, Percentage (Rate) 65.00%
Multi-employer Plan, Employer Contribution, Percentage (Rate) 5.00%
Maximum [Member]  
Multiemployer Plans, Red Zone, Percentage (Rate) 65.00%
UNITED STATES | Pension Plan [Member]  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets, Next Fiscal Year 5.75%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ $ 7
Foreign Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ $ 17
Growth Portfolio [Member] | UNITED STATES | Pension Plan [Member]  
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 21.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 20.00%
Immunizing Portfolio [Member] | UNITED STATES | Pension Plan [Member]  
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 77.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 78.00%
Liquidity Portfolio [Member] | UNITED STATES | Pension Plan [Member]  
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 2.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 2.00%