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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jan. 01, 2023	Dec. 31, 2022	Sep. 01, 2022
Debt Securities, Available-for-Sale, Amortized Cost	$ 179,926		$ 186,826	$ 82,200
Gross unrealized gains, available for sale securities	68		99
Gross unrealized losses, available for sale securities	(23,249)		(24,018)
Debt Securities, Available-for-Sale, Total	156,745		162,907	$ 74,400
Securities available for sale, AFS	0
Amortized cost, held to maturity securities	151,821		153,158
Gross unrealized gains, held to maturity securities	28		0
Gross unrealized losses, held to maturity securities	(12,000)		(11,361)
Fair value, held to maturity securities	139,849		141,797
Securities available for sale, HTM	(144)		0
Amortized cost	331,747		339,984
Gross unrealized gains	96		99
Gross unrealized losses	(35,249)		(35,379)
Total securities, fair value	296,594		304,704
Total securities, allowance for credit loss	(144)
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	12,472		12,468
Gross unrealized gains, available for sale securities	0		0
Gross unrealized losses, available for sale securities	(1,229)		(1,239)
Debt Securities, Available-for-Sale, Total	11,243		11,229
Securities available for sale, AFS	0
Amortized cost, held to maturity securities	38,639		38,211
Gross unrealized gains, held to maturity securities	0		0
Gross unrealized losses, held to maturity securities	(716)		(568)
Fair value, held to maturity securities	37,923		37,643
Securities available for sale, HTM	0		0
US Agency and Mortgage-backed Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	103,238		109,972
Gross unrealized gains, available for sale securities	62		95
Gross unrealized losses, available for sale securities	(13,257)		(13,149)
Debt Securities, Available-for-Sale, Total	90,043		96,918
Securities available for sale, AFS	0
Amortized cost, held to maturity securities	98,223		99,374
Gross unrealized gains, held to maturity securities	0		0
Gross unrealized losses, held to maturity securities	(9,679)		(9,189)
Fair value, held to maturity securities	88,544		90,185
Securities available for sale, HTM	0		0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	64,216		64,386
Gross unrealized gains, available for sale securities	6		4
Gross unrealized losses, available for sale securities	(8,763)		(9,630)
Debt Securities, Available-for-Sale, Total	55,459		54,760
Securities available for sale, AFS	0
Amortized cost, held to maturity securities	11,959		12,573
Gross unrealized gains, held to maturity securities	28		0
Gross unrealized losses, held to maturity securities	(1,098)		(1,252)
Fair value, held to maturity securities	10,889		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	(507)		(352)
Fair value, held to maturity securities	2,493		2,648
Securities available for sale, HTM	$ (144)	$ 0	$ 0

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