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Note 6 - Retirement Plans (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (2)  
Defined Contribution Plan, Employer Discretionary Contribution Amount 15  
Defined Contribution Plan, Expected Contributions, Remainder of Fiscal Year 13  
Profit Sharing Contribution [Member]    
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 9
Pension Plan [Member] | Gray Pension Plan [Member]    
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 4