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Note 11 - Retirement Plans (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Stock, Capital Shares Reserved for Future Issuance (in shares) 4,006,948 6,130,944  
Pension Plan [Member] | Gray Pension Plan [Member]      
Defined Benefit Plan, Accumulated Benefit Obligation $ 151 $ 135  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 4    
Capital Accumulation Plan [Member]      
Defined Contribution Plan, Employer Discretionary Contribution Amount 13 11 $ 6
Defined Contribution Plan, Expected Contributions In Next Twelve Months $ 13    
Common Stock, Capital Shares Reserved for Future Issuance (in shares) 960,311    
Capital Accumulation Plan [Member] | First 3% of Each Employee's Salary Deferral [Member]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 100.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 1.00%    
Capital Accumulation Plan [Member] | Next 2% of Each Employee's Salary Deferral [Member]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 5.00%    
Profit Sharing Contribution [Member]      
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 6 $ 5 $ 4