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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Sep. 01, 2022
--- | --- | --- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost | $ 173,458 |  | $ 186,826 | $ 82,200
Gross unrealized gains, available for sale securities | 61 |  | 99 |
Gross unrealized losses, available for sale securities | (20,662) |  | (24,018) |
Debt Securities, Available-for-Sale | 152,857 |  | 162,907 | $ 74,400
Securities available for sale, AFS | 0 |  | 0 |
Amortized cost, held to maturity securities | 148,351 |  | 153,158 |
Gross unrealized gains, held to maturity securities | 107 |  | 0 |
Gross unrealized losses, held to maturity securities | (10,844) |  | (11,361) |
Fair value, held to maturity securities | 137,614 |  | 141,797 |
Securities available for sale, HTM | (107) |  | 0 |
Amortized cost | 321,809 |  | 339,984 |
Gross unrealized gains | 168 |  | 99 |
Gross unrealized losses | (31,506) |  | (35,379) |
Total securities, fair value | 290,471 |  | 304,704 |
Total securities, allowance for credit loss | (107) |  |  |
US Treasury Securities [Member] |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 12,476 |  | 12,468 |
Gross unrealized gains, available for sale securities | 0 |  | 0 |
Gross unrealized losses, available for sale securities | (1,026) |  | (1,239) |
Debt Securities, Available-for-Sale | 11,450 |  | 11,229 |
Securities available for sale, AFS | 0 |  |  |
Amortized cost, held to maturity securities | 39,085 |  | 38,211 |
Gross unrealized gains, held to maturity securities | 0 |  | 0 |
Gross unrealized losses, held to maturity securities | (389) |  | (568) |
Fair value, held to maturity securities | 38,696 |  | 37,643 |
Securities available for sale, HTM | 0 |  | 0 |
US Agency and Mortgage-backed Securities [Member] |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 96,937 |  | 109,972 |
Gross unrealized gains, available for sale securities | 55 |  | 95 |
Gross unrealized losses, available for sale securities | (12,192) |  | (13,149) |
Debt Securities, Available-for-Sale | 84,800 |  | 96,918 |
Securities available for sale, AFS | 0 |  |  |
Amortized cost, held to maturity securities | 94,617 |  | 99,374 |
Gross unrealized gains, held to maturity securities | 0 |  | 0 |
Gross unrealized losses, held to maturity securities | (8,992) |  | (9,189) |
Fair value, held to maturity securities | 85,625 |  | 90,185 |
Securities available for sale, HTM | 0 |  | 0 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | 64,045 |  | 64,386 |
Gross unrealized gains, available for sale securities | 6 |  | 4 |
Gross unrealized losses, available for sale securities | (7,444) |  | (9,630) |
Debt Securities, Available-for-Sale | 56,607 |  | 54,760 |
Securities available for sale, AFS | 0 |  |  |
Amortized cost, held to maturity securities | 11,649 |  | 12,573 |
Gross unrealized gains, held to maturity securities | 107 |  | 0 |
Gross unrealized losses, held to maturity securities | (943) |  | (1,252) |
Fair value, held to maturity securities | 10,813 |  | 11,321 |
Securities available for sale, HTM | 0 |  | 0 |
Corporate Debt Securities [Member] |  |  |  |
Amortized cost, held to maturity securities | 3,000 |  | 3,000 |
Gross unrealized gains, held to maturity securities | 0 |  | 0 |
Gross unrealized losses, held to maturity securities | (520) |  | (352) |
Fair value, held to maturity securities | 2,480 |  | 2,648 |
Securities available for sale, HTM | $ (107) | $ 0 | $ 0 |

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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