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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

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).

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