Note 11 - Retirement Plans - Summary of Funded Status and Amounts Recognized on Balance Sheets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Projected benefit obligation at beginning of year	$ 96	$ 104
Interest cost	5	4	$ 5
Actuarial (gain) loss	1	(7)
Benefits paid	(4)	(5)
Effect of pension settlement	(41)	0
Projected benefit obligation at end of year	57	96	104
Fair value of pension plan assets at beginning of year	112	117
Actual return on plan assets	6	0
Benefits paid	(4)	(5)
Effect of pension settlement	(41)	0
Fair value of pension plan assets at end of year	73	112	$ 117
Funded status of pension plan	16	16
Accrued benefit cost	24	28
Accumulated other comprehensive loss	(8)	(12)
Net asset recognized	$ 16	$ 16