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Note 8 - Employee Benefit Plans - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value, plan assets |  | $ 32,509 | $ 29,746
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 24,905 | 22,734
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets |  | 7,604 | 7,012
Cash [Member] |  |  |
Fair value, plan assets |  | 867 | 415
Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 867 | 415
Defined Benefit Plan, Equity Securities, US [Member] |  |  |
Fair value, plan assets |  | 17,540 | 15,459
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 17,540 | 15,459
Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |
Fair value, plan assets |  | 400 | 770
Defined Benefit Plan, Equity Securities, Non-US [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 400 | 770
Equity Funds [Member] |  |  |
Fair value, plan assets | [1] | 6,098 | 6,090
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets | [1] | 6,098 | 6,090
US States and Political Subdivisions Debt Securities [Member] |  |  |
Fair value, plan assets |  | 51 | 51
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets |  | 51 | 51
Corporate Debt Securities [Member] |  |  |
Fair value, plan assets | [2] | 7,553 | 6,961
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets | [2] | $ 7,553 | $ 6,961
[1] | This category comprises actively managed equity funds invested in large-cap and mid-cap U.S. companies.
[2] | This category represents investment grade bonds of U.S. issuers from diverse industries.

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