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Note 7 - Retirement Plans (Details Textual) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Defined Contribution Plan, Expected Contributions, Remainder of Fiscal Year $ 7  
Profit Sharing Contribution [Member]    
Defined Contribution Plan, Employer Discretionary Contribution Amount 9 $ 7
Pension Plan [Member] | Gray Pension Plan [Member]    
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 4