Note 11 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Effective Income Tax Rate Reconciliation, Percent, Total	25.00%	28.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	4.00%	5.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total		2.00%
Proceeds from Income Tax Refunds			$ 21
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 324
Minimum [Member]
Income Taxes Paid, Net, Total	170
Maximum [Member]
Income Taxes Paid, Net, Total	$ 190