Note 8 - Stock-based Compensation - Stock-based Compensation Expense and Related Income Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Stock-based compensation expense, gross	$ 22	$ 22	$ 20
Income tax benefit at our statutory rate associated with share-based compensation	0	(6)	(5)
Stock-based compensation expense, net	$ 22	$ 16	$ 15