Note 10 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statutory federal rate applied to income before income tax expense	$ 35	$ 114	$ 53
Current year permanent items	33	3	13
State and local taxes, net of federal tax benefit	10	27	13
Change in valuation allowance	0	1	(2)
Net operating loss carryback	0	(7)	0
Other items, net	0	(4)	(1)
Income tax expense as recorded	$ 78	$ 134	$ 76
Effective income tax rate	46.00%	25.00%	30.00%