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Note 8 - Employee Benefit Plans - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value, plan assets |  | $ 39,208 | $ 32,509
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 29,333 | 24,905
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets |  | 9,875 | 7,604
Cash [Member] |  |  |
Fair value, plan assets |  | 1,228 | 867
Cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 1,228 | 867
Defined Benefit Plan, Equity Securities, US [Member] |  |  |
Fair value, plan assets |  | 21,373 | 17,540
Defined Benefit Plan, Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 21,373 | 17,540
Defined Benefit Plan, Equity Securities, Non-US [Member] |  |  |
Fair value, plan assets |  | 200 | 400
Defined Benefit Plan, Equity Securities, Non-US [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets |  | 200 | 400
Equity Funds [Member] |  |  |
Fair value, plan assets | [1] | 6,532 | 6,098
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value, plan assets | [1] | 6,532 | 6,098
US States and Political Subdivisions Debt Securities [Member] |  |  |
Fair value, plan assets |  | 50 | 51
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets |  | 50 | 51
Corporate Debt Securities [Member] |  |  |
Fair value, plan assets | [2] | 9,825 | 7,553
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value, plan assets | [2] | $ 9,825 | $ 7,553
[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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