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Note 7 - Retirement Plans (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 01, 2025
Apr. 25, 2025
Sep. 30, 2025
401(k) Plan [Member]        
Defined Contribution Plan, Employer Discretionary Contribution Amount       $ 19
Defined Contribution Plan, Expected Contributions, Remainder of Fiscal Year $ 5     5
Gray Pension Plan Annuity [Member]        
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant     $ 18  
Defined Benefit Plan, Benefit Obligation, Benefits Paid   $ 15    
Gray Pension Plan [Member]        
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) (33)      
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment       4
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax $ (3)     $ (3)