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Note 8 - Employee Retirement Plans - Pension Plan Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Fair value of plan assets | $ 56,779 | $ 56,495 | $ 59,625 | $ 56,790
Pension Plan [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 56,779 | 56,495 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 55,868 | 39,705 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 911 | 1,626 |  |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Change In Plan Assets [Member] |  |  |  |
Fair value of plan assets | 0 | 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 | 15,164 |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] |  |  |  |
Fair value of plan assets | 36,240 | 24,947 |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | 36,240 | 21,780 |  |
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 | 3,167 |  |
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] |  |  |  |
Fair value of plan assets | 19,628 | 29,922 |  |
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | 19,628 | 17,925 |  |
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | 0 | 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 | 11,997 |  |
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |  |  |
Fair value of plan assets | 911 | 1,626 |  |
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 | 911 | 1,626 |  |
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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