Note 8 - Employee Retirement Plans - Pension Plan Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair value of plan assets	$ 30,088	$ 30,255	$ 30,843	$ 45,378
Pension Plan [Member]
Fair value of plan assets	30,088	30,255
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	16,781	17,119
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	11,054	10,505
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	2,253	2,631
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member]
Fair value of plan assets	14,084	14,927
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	14,084	14,927
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member]
Fair value of plan assets	13,124	11,962
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	2,697	2,192
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	10,427	9,770
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Alternative Securities [Member]
Fair value of plan assets	2,253	2,631
Pension Plan [Member] | Defined Benefit Plan, Alternative Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Alternative Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Alternative Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	2,253	2,631
Pension Plan [Member] | Defined Benefit Plan, Alternative Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets	627	735
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	627	735
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair value of plan assets	$ 0	$ 0