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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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