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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022	Sep. 01, 2022
Debt Securities, Available-for-Sale, Amortized Cost	$ 163,256	$ 173,458		$ 82,200
Gross unrealized gains, available for sale securities	65	61
Gross unrealized losses, available for sale securities	(17,308)	(20,662)
Debt Securities, Available-for-Sale	146,013	152,857		$ 74,400
Securities available for sale, AFS	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	121,529	148,351
Gross unrealized gains, held to maturity securities	108	107
Gross unrealized losses, held to maturity securities	(7,818)	(10,844)
Fair value, held to maturity securities	113,819	137,614
Securities available for sale, HTM	(104)	(107)	$ 0
Amortized cost	284,785	321,809
Gross unrealized gains	173	168
Gross unrealized losses	(25,126)	(31,506)
Total securities, fair value	259,832	290,471
Total securities, allowance for credit loss	(104)	(107)
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	12,481	12,476
Gross unrealized gains, available for sale securities	0	0
Gross unrealized losses, available for sale securities	(652)	(1,026)
Debt Securities, Available-for-Sale	11,829	11,450
Securities available for sale, AFS	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	19,535	39,085
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(60)	(389)
Fair value, held to maturity securities	19,475	38,696
Securities available for sale, HTM	0	0	0
US Agency and Mortgage-backed Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	87,739	96,937
Gross unrealized gains, available for sale securities	57	55
Gross unrealized losses, available for sale securities	(9,641)	(12,192)
Debt Securities, Available-for-Sale	78,155	84,800
Securities available for sale, AFS	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	88,342	94,617
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(6,509)	(8,992)
Fair value, held to maturity securities	81,833	85,625
Securities available for sale, HTM	0	0	0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	63,036	64,045
Gross unrealized gains, available for sale securities	8	6
Gross unrealized losses, available for sale securities	(7,015)	(7,444)
Debt Securities, Available-for-Sale	56,029	56,607
Securities available for sale, AFS	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	10,653	11,649
Gross unrealized gains, held to maturity securities	108	107
Gross unrealized losses, held to maturity securities	(799)	(943)
Fair value, held to maturity securities	9,962	10,813
Securities available for sale, HTM	(1)	0	0
Corporate Debt Securities [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	2,999	3,000
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(450)	(520)
Fair value, held to maturity securities	2,549	2,480
Securities available for sale, HTM	$ (103)	$ (107)	$ 0

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