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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Sep. 01, 2022
Debt Securities, Available-for-Sale, Amortized Cost	$ 173,458		$ 186,826	$ 82,200
Gross unrealized gains, available for sale securities	61		99
Gross unrealized losses, available for sale securities	(20,662)		(24,018)
Debt Securities, Available-for-Sale	152,857		162,907	$ 74,400
Securities available for sale, AFS	0		0
Amortized cost, held to maturity securities	148,351		153,158
Gross unrealized gains, held to maturity securities	107		0
Gross unrealized losses, held to maturity securities	(10,844)		(11,361)
Fair value, held to maturity securities	137,614		141,797
Securities available for sale, HTM	(107)		0
Amortized cost	321,809		339,984
Gross unrealized gains	168		99
Gross unrealized losses	(31,506)		(35,379)
Total securities, fair value	290,471		304,704
Total securities, allowance for credit loss	(107)
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	12,476		12,468
Gross unrealized gains, available for sale securities	0		0
Gross unrealized losses, available for sale securities	(1,026)		(1,239)
Debt Securities, Available-for-Sale	11,450		11,229
Securities available for sale, AFS	0
Amortized cost, held to maturity securities	39,085		38,211
Gross unrealized gains, held to maturity securities	0		0
Gross unrealized losses, held to maturity securities	(389)		(568)
Fair value, held to maturity securities	38,696		37,643
Securities available for sale, HTM	0		0
US Agency and Mortgage-backed Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	96,937		109,972
Gross unrealized gains, available for sale securities	55		95
Gross unrealized losses, available for sale securities	(12,192)		(13,149)
Debt Securities, Available-for-Sale	84,800		96,918
Securities available for sale, AFS	0
Amortized cost, held to maturity securities	94,617		99,374
Gross unrealized gains, held to maturity securities	0		0
Gross unrealized losses, held to maturity securities	(8,992)		(9,189)
Fair value, held to maturity securities	85,625		90,185
Securities available for sale, HTM	0		0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	64,045		64,386
Gross unrealized gains, available for sale securities	6		4
Gross unrealized losses, available for sale securities	(7,444)		(9,630)
Debt Securities, Available-for-Sale	56,607		54,760
Securities available for sale, AFS	0
Amortized cost, held to maturity securities	11,649		12,573
Gross unrealized gains, held to maturity securities	107		0
Gross unrealized losses, held to maturity securities	(943)		(1,252)
Fair value, held to maturity securities	10,813		11,321
Securities available for sale, HTM	0		0
Corporate Debt Securities [Member]
Amortized cost, held to maturity securities	3,000		3,000
Gross unrealized gains, held to maturity securities	0		0
Gross unrealized losses, held to maturity securities	(520)		(352)
Fair value, held to maturity securities	2,480		2,648
Securities available for sale, HTM	$ (107)	$ 0	$ 0

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