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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Jan. 01, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Equity, Attributable to Parent | $ 934,094 | $ 894,535 | $ 874,711 |  | $ 858,103 | $ 806,918 | $ 808,082 | $ 794,368 | $ 760,432
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2023-02 [Member] |  |  |  |  |  |  |  |  |
Equity, Attributable to Parent |  |  |  | $ 2,500 |  |  |  |  |

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