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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 01, 2022
--- | --- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost | $ 169,854 | $ 173,458 | $ 82,200
Gross unrealized gains, available for sale securities | 51 | 61 |
Gross unrealized losses, available for sale securities | (22,230) | (20,662) |
Debt Securities, Available-for-Sale | 147,675 | 152,857 | $ 74,400
Securities available for sale, AFS | 0 | 0 |
Amortized cost, held to maturity | 125,941 | 148,351 |
Gross unrealized gains, held to maturity securities | 40 | 107 |
Gross unrealized losses, held to maturity securities | (11,892) | (10,844) |
Fair value, held to maturity securities | 114,089 | 137,614 |
Securities available for sale, HTM | (116) | (107) |
Amortized cost | 295,795 | 321,809 |
Gross unrealized gains | 91 | 168 |
Gross unrealized losses | (34,122) | (31,506) |
Total securities, fair value | 261,764 | 290,471 |
Total securities, allowance for credit loss | (116) | (107) |
US Treasury Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 12,478 | 12,476 |
Gross unrealized gains, available for sale securities | 0 | 0 |
Gross unrealized losses, available for sale securities | (1,079) | (1,026) |
Debt Securities, Available-for-Sale | 11,399 | 11,450 |
Securities available for sale, AFS | 0 | 0 |
Amortized cost, held to maturity | 19,277 | 39,085 |
Gross unrealized gains, held to maturity securities | 0 | 0 |
Gross unrealized losses, held to maturity securities | (349) | (389) |
Fair value, held to maturity securities | 18,928 | 38,696 |
Securities available for sale, HTM | 0 | 0 |
US Agency and Mortgage-backed Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 93,915 | 96,937 |
Gross unrealized gains, available for sale securities | 50 | 55 |
Gross unrealized losses, available for sale securities | (12,997) | (12,192) |
Debt Securities, Available-for-Sale | 80,968 | 84,800 |
Securities available for sale, AFS | 0 | 0 |
Amortized cost, held to maturity | 92,019 | 94,617 |
Gross unrealized gains, held to maturity securities | 0 | 0 |
Gross unrealized losses, held to maturity securities | (10,033) | (8,992) |
Fair value, held to maturity securities | 81,986 | 85,625 |
Securities available for sale, HTM | 0 | 0 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 63,461 | 64,045 |
Gross unrealized gains, available for sale securities | 1 | 6 |
Gross unrealized losses, available for sale securities | (8,154) | (7,444) |
Debt Securities, Available-for-Sale | 55,308 | 56,607 |
Securities available for sale, AFS | 0 | 0 |
Amortized cost, held to maturity | 11,645 | 11,649 |
Gross unrealized gains, held to maturity securities | 40 | 107 |
Gross unrealized losses, held to maturity securities | (996) | (943) |
Fair value, held to maturity securities | 10,689 | 10,813 |
Securities available for sale, HTM | (1) | 0 |
Corporate Debt Securities [Member] |  |  |
Amortized cost, held to maturity | 3,000 | 3,000 |
Gross unrealized gains, held to maturity securities | 0 | 0 |
Gross unrealized losses, held to maturity securities | (514) | (520) |
Fair value, held to maturity securities | 2,486 | 2,480 |
Securities available for sale, HTM | $ (115) | $ (107) |

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