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Note 3 - Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost | $ 282,527 | $ 304,805
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 8 | 3
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 19,913 | 28,207
Debt securities, available-for-sale, at fair value | 262,622 | 276,601
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 18,737 | 16,863
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 10 | 4
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | 1,065 | 1,188
Debt Securities, Held-to-Maturity, Fair Value | 17,682 | 15,679
US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 69,717 | 74,404
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 4,145 | 6,202
Debt securities, available-for-sale, at fair value | 65,572 | 68,202
US Government Corporations and Agencies Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 88,668 | 88,978
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 5,360 | 8,077
Debt securities, available-for-sale, at fair value | 83,308 | 80,901
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 7,450 | 7,450
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 588 | 916
Debt securities, available-for-sale, at fair value | 6,862 | 6,534
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 75,422 | 81,634
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 7 | 2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 7,090 | 8,846
Debt securities, available-for-sale, at fair value | 68,339 | 72,790
Nontaxable Municipal Bonds [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 4,596 | 7,416
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 222 | 245
Debt securities, available-for-sale, at fair value | 4,374 | 7,171
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 15,454 | 13,580
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 10 | 4
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | 765 | 872
Debt Securities, Held-to-Maturity, Fair Value | 14,699 | 12,712
Taxable Municipal Bonds [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost | 36,674 | 44,923
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 1
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 2,508 | 3,921
Debt securities, available-for-sale, at fair value | 34,167 | 41,003
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,283 | 3,283
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | 300 | 316
Debt Securities, Held-to-Maturity, Fair Value | $ 2,983 | $ 2,967

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