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Note 3 - Investment Securities - Amortized Cost of Marketable Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Equity Securities, FV-NI, Amortized Cost | $ 1,452 |  | $ 1,452 |  | $ 1,425
Equity Securities, FV-NI, Fair Value | 1,388 |  | 1,388 |  | 1,336
Net gains (losses) recognized during the period on equity securities | 49 | $ (33) | 25 | $ (78) |
Less net losses recognized during the period on equity securities sold during the period | 0 | 0 | 0 | (61) |
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at period end | 49 | $ (33) | 25 | $ (17) |
Mutual Fund [Member] |  |  |  |  |
Equity Securities, FV-NI, Amortized Cost | 1,442 |  | 1,442 |  | 1,415
Equity Securities, FV-NI, Fair Value | 1,294 |  | 1,294 |  | 1,240
Equity Securities [Member] |  |  |  |  |
Equity Securities, FV-NI, Amortized Cost | 10 |  | 10 |  | 10
Equity Securities, FV-NI, Fair Value | $ 94 |  | $ 94 |  | $ 96

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