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Note 3 - Securities (Tables)

3 Months Ended

Mar. 31, 2025

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
March 31, 2025
Municipal securities		$	702			$	4			$	—			$	706
U.S. Treasury Bills and Notes			343,183				77				(405	)			342,855
U.S. government-sponsored agencies			10,000				—				(19	)			9,981
Mortgage-backed securities - residential			2,824				31				(55	)			2,800
Collateralized mortgage obligations - residential			833				—				(10	)			823
		$	357,542			$	112			$	(489	)		$	357,165
December 31, 2024
Municipal securities		$	703			$	3			$	—			$	706
U.S. Treasury Bills and Notes			246,876				103				(689	)			246,290
U.S. government-sponsored agencies			109,900				1				(128	)			109,773
Mortgage-backed securities - residential			2,949				31				(69	)			2,911
Collateralized mortgage obligations - residential			862				—				(12	)			850
		$	361,290			$	138			$	(898	)		$	360,530

Investments Classified by Contractual Maturity Date [Table Text Block]

		March 31, 2025
		Amortized Cost				Fair Value
Due in one year or less		$	330,291			$	330,041
Due after one year through five years			23,594				23,501
			353,885				353,542
Mortgage-backed securities - residential			2,824				2,800
Collateralized mortgage obligations - residential			833				823
		$	357,542			$	357,165

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [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
March 31, 2025
U.S. Treasury Bills and Notes			10			$	98,959			$	(11	)			49			$	35,490			$	(394	)			59			$	134,449			$	(405	)
U.S. government-sponsored agencies			1				9,981				(19	)			—				—				—				1				9,981				(19	)
Mortgage-backed securities - residential			—				—				—				5				1,158				(55	)			5				1,158				(55	)
Collateralized mortgage obligations - residential			—				—				—				5				823				(10	)			5				823				(10	)
			11			$	108,940			$	(30	)			59			$	37,471			$	(459	)			70			$	146,411			$	(489	)
December 31, 2024
U.S. Treasury Bills and Notes			—			$	—			$	—				73			$	48,609			$	(689	)			73			$	48,609			$	(689	)
U.S. government-sponsored agencies			10				79,872				(128	)			—				—				—				10				79,872				(128	)
Mortgage-backed securities - residential			—				—				—				7				1,364				(69	)			7				1,364				(69	)
Collateralized mortgage obligations - residential			—				—				—				5				850				(12	)			5				850				(12	)
			10			$	79,872			$	(128	)			85			$	50,823			$	(770	)			95			$	130,695			$	(898	)

X

- Definition

Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
-Section 55
-Paragraph 8
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