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Note 9 - Employee Retirement Plans - Pension Plan Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Fair value of plan assets | $ 45,378 | $ 56,779 | $ 56,495 | $ 59,625
Pension Plan [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 45,377 | 56,779 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 30,281 | 55,868 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 11,894 | 911 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 3,202 | 0 |  |
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] |  |  |  |
Fair value of plan assets | 31,196 | 36,240 |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | 26,847 | 36,240 |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | 1,147 | 0 |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | 3,202 | 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 | 12,928 | 19,628 |  |
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | 3,434 | 19,628 |  |
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | 9,494 | 0 |  |
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, Cash and Cash Equivalents [Member] |  |  |  |
Fair value of plan assets | 1,253 | 911 |  |
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 | 1,253 | 911 |  |
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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