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Note 9 - Employee Retirement Plans - Pension Plan Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Fair value of plan assets | $ 30,255 | $ 30,843 | $ 45,378 | $ 56,779
Pension Plan [Member] |  |  |  |
Fair value of plan assets | 30,254 | 30,843 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | 17,119 | 14,508 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | 10,504 | 10,831 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | 2,631 | 5,504 |  |
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 | 14,927 | 14,269 |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | 14,927 | 14,212 |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | 0 | 57 |  |
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 | 11,962 | 10,058 |  |
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | 2,192 | 296 |  |
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | 9,770 | 9,762 |  |
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 | 2,631 | 5,504 |  |
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 | 2,631 | 5,504 |  |
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 | 734 | 1,012 |  |
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 | 734 | 1,012 |  |
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 |  |

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