Note 11 - Retirement Plans - Pension Plan Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined benefit plan, fair value of plan assets	$ 73	$ 112	$ 117
Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of plan assets	73	98
Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of plan assets	0	14
Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of plan assets	0	0
Cash and Cash Equivalents [Member]
Defined benefit plan, fair value of plan assets	14	4
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of plan assets	14	4
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of plan assets	0	0
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of plan assets	0	0
Insurance General Account [Member]
Defined benefit plan, fair value of plan assets		14
Insurance General Account [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of plan assets		0
Insurance General Account [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of plan assets		14
Insurance General Account [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of plan assets		0
Equity Securities [Member]
Defined benefit plan, fair value of plan assets	59
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of plan assets	59
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of plan assets	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of plan assets	$ 0
Fixed Income Securities [Member]
Defined benefit plan, fair value of plan assets		94
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of plan assets		94
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined benefit plan, fair value of plan assets		0
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined benefit plan, fair value of plan assets		$ 0