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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022	Sep. 01, 2022
Debt Securities, Available-for-Sale, Amortized Cost	$ 166,726	$ 173,458		$ 82,200
Gross unrealized gains, available for sale securities	54	61
Gross unrealized losses, available for sale securities	(21,964)	(20,662)
Debt Securities, Available-for-Sale	144,816	152,857		$ 74,400
Securities available for sale, AFS	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	123,606	148,351
Gross unrealized gains, held to maturity securities	27	107
Gross unrealized losses, held to maturity securities	(11,391)	(10,844)
Fair value, held to maturity securities	112,242	137,614
Securities available for sale, HTM	(109)	(107)	$ 0
Amortized cost	290,332	321,809
Gross unrealized gains	81	168
Gross unrealized losses	(33,355)	(31,506)
Total securities, fair value	257,058	290,471
Total securities, allowance for credit loss	(109)	(107)
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	12,480	12,476
Gross unrealized gains, available for sale securities	0	0
Gross unrealized losses, available for sale securities	(1,019)	(1,026)
Debt Securities, Available-for-Sale	11,461	11,450
Securities available for sale, AFS	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	19,404	39,085
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(310)	(389)
Fair value, held to maturity securities	19,094	38,696
Securities available for sale, HTM	0	0	0
US Agency and Mortgage-backed Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	90,869	96,937
Gross unrealized gains, available for sale securities	52	55
Gross unrealized losses, available for sale securities	(12,091)	(12,192)
Debt Securities, Available-for-Sale	78,830	84,800
Securities available for sale, AFS	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	89,911	94,617
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(9,556)	(8,992)
Fair value, held to maturity securities	80,355	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	63,377	64,045
Gross unrealized gains, available for sale securities	2	6
Gross unrealized losses, available for sale securities	(8,854)	(7,444)
Debt Securities, Available-for-Sale	54,525	56,607
Securities available for sale, AFS	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	11,291	11,649
Gross unrealized gains, held to maturity securities	27	107
Gross unrealized losses, held to maturity securities	(1,039)	(943)
Fair value, held to maturity securities	10,279	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	3,000	3,000
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(486)	(520)
Fair value, held to maturity securities	2,514	2,480
Securities available for sale, HTM	$ (108)	$ (107)	$ 0

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