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Note 3 - Securities (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
Available-for-Sale Securities
September 30, 2023
Certificates of deposit		$	2,725			$	—			$	—			$	2,725
Municipal securities			240				—				(11	)			229
U.S. Treasury Notes			128,326				—				(5,231	)			123,095
U.S. government-sponsored agencies			28,000				—				(137	)			27,863
Mortgage-backed securities - residential			3,622				23				(165	)			3,480
Collateralized mortgage obligations - residential			1,059				—				(26	)			1,033
		$	163,972			$	23			$	(5,570	)		$	158,425
December 31, 2022
Certificates of deposit		$	2,233			$	—			$	—			$	2,233
Municipal securities			240				—				(15	)			225
U.S. Treasury Notes			170,906				—				(7,803	)			163,103
U.S. government-sponsored agencies			40,000				—				(301	)			39,699
Mortgage-backed securities - residential			3,997				27				(143	)			3,881
Collateralized mortgage obligations - residential			1,223				—				(26	)			1,197
		$	218,599			$	27			$	(8,288	)		$	210,338

Investments Classified by Contractual Maturity Date [Table Text Block]

		September 30, 2023
		Amortized Cost				Fair Value
Due in one year or less		$	87,637			$	86,118
Due after one year through five years			71,654				67,794
			159,291				153,912
Mortgage-backed securities - residential			3,622				3,480
Collateralized mortgage obligations - residential			1,059				1,033
		$	163,972			$	158,425

Schedule of Unrealized Loss on Investments [Table Text Block]

		Less than 12 Months												12 Months or More												Total
		Count				Fair Value				Unrealized Loss				Count				Fair Value				Unrealized Loss				Count				Fair Value				Unrealized Loss
September 30, 2023
Municipal securities			—			$	—			$	—				1			$	229			$	(11	)			1			$	229			$	(11	)
U.S. Treasury Notes			—				—				—				181				123,095				(5,231	)			181				123,095				(5,231	)
U.S. government-sponsored agencies			3				12,922				(78	)			3				14,941				(59	)			6				27,863				(137	)
Mortgage-backed securities - residential			2				111				(3	)			16				2,652				(162	)			18				2,763				(165	)
Collateralized mortgage obligations - residential			—				—				—				7				1,033				(26	)			7				1,033				(26	)
			5			$	13,033			$	(81	)			208			$	141,950			$	(5,489	)			213			$	154,983			$	(5,570	)
December 31, 2022
Municipal securities			1			$	225			$	(15	)			—			$	—			$	—				1			$	225			$	(15	)
U.S. Treasury Notes			147				104,439				(4,104	)			53				58,664				(3,699	)			200				163,103				(7,803	)
U.S. government-sponsored agencies			9				39,699				(301	)			—				—				—				9				39,699				(301	)
Mortgage-backed securities - residential			18				3,016				(143	)			—				—				—				18				3,016				(143	)
Collateralized mortgage obligations - residential			5				1,009				(18	)			1				171				(8	)			6				1,180				(26	)
			180			$	148,388			$	(4,581	)			54			$	58,835			$	(3,707	)			234			$	207,223			$	(8,288	)

Gain (Loss) on Securities [Table Text Block]

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2023				2022				2023				2022
Proceeds		$	—			$	—			$	42,631			$	—
Gross gains			—				—				—				—
Gross losses			—				—				(454	)			—

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Tabular disclosure of realized and unrealized gain (loss) on investment in security.

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-Topic 220
-SubTopic 10
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-Paragraph 2
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