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Note 14 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair value of plan assets | $ 30,051 | $ 32,353 | $ 31,738
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 14,910 | 15,658 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair value of plan assets | 2,371 | 2,744 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member] |  |  |
Fair value of plan assets | 2,008 | 2,272 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Mid Cap [Member] |  |  |
Fair value of plan assets | 863 | 867 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US, Small Cap [Member] |  |  |
Fair value of plan assets | 169 | 224 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |
Fair value of plan assets | 1,733 | 2,256 |
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] |  |  |
Fair value of plan assets | 405 | 391 |
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member] |  |  |
Fair value of plan assets | 547 | 600 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] |  |  |
Fair value of plan assets | 6,814 | 6,304 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets | 15,141 | 16,695 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Large Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Mid Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US, Small Cap [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member] |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] |  |  |
Fair value of plan assets | $ 15,141 | $ 16,695 |

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