Note 11 - Retirement Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	2,821,480	4,006,948
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	$ 119	$ 108	$ 97
Pension Plan [Member] | Gray Pension Plan [Member]
Defined Benefit Plan, Accumulated Benefit Obligation	140	151
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	4
Capital Accumulation Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	15	13	11
Defined Contribution Plan, Expected Contributions In Next Twelve Months	$ 17
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	566,267
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	$ 7	$ 6	$ 5
Meredith Plan [Member]
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	15
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	$ 17