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Note 3 - Securities (Details Textual) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Equity Securities, FV-NI, Current | $ 3,274,000 |  | $ 3,274,000 |  | $ 3,132,000
Equity Securities, FV-NI, Realized Gain (Loss) | 0 | $ 0 | 0 | $ 0 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | (141,000) | $ (144,000) | 60,000 | $ (141,000) |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | $ 4,164,000,000 |  | $ 4,164,000,000 |  |
Number of Debt Securities, Available-for-sale, Sold | 0 | 0 | 18 | 24 |
Debt Securities, Available-for-Sale, Book Value of Securities Sold |  |  | $ 28,258,000 | $ 42,791,000 |
Debt Securities, Available-for-Sale, Realized Gain |  |  | 106,000 | 215,000 |
Debt Securities, Available-for-Sale, Realized Loss |  |  |  | 72,000 |
Debt Securities, Available-for-Sale, Realized Gain (Loss) |  |  |  | 143,000 |
Asset Pledged as Collateral [Member] | Public Funds [Member] |  |  |  |  |
Debt Securities | $ 305,109,000 |  | 305,109,000 |  | $ 288,199,000
Debt Securities, Called During The Period [member] |  |  |  |  |
Debt Securities, Realized Gain (Loss) | $ (8,000) | $ 13,000 | $ (9,000) | $ 13,000 |

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