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Note 8 - Employee Benefit Plans - Fair Value of Plan Assets By Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fair value of plan assets | $ 15,576 | $ 27,252 | $ 23,926
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets | 185 | 1,907 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets | 15,391 | 25,345 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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