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Note 3 - Debt Securities (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

		*December 31, 2023*
		*Amortized*				*Unrealized*				*Unrealized*				*Fair*
		*Cost*				*Gains*				*Losses*				*Value*
(Amounts in thousands)
U.S. Agency securities		$	5,750			$	—			$	(1	)		$	5,749
U.S. Treasury securities			146,653				16				(843	)			145,826
Municipal securities			19,528				11				(162	)			19,377
Corporate Notes			28,566				—				(1,485	)			27,081
Mortgage-backed Agency securities			94,548				2				(11,622	)			82,928
Total		$	295,045			$	29			$	(14,113	)		$	280,961

		*December 31, 2022*
		*Amortized*				*Unrealized*				*Unrealized*				*Fair*
		*Cost*				*Gains*				*Losses*				*Value*
(Amounts in thousands)
U.S. Agency securities		$	1,500			$	—			$	(15	)		$	1,485
U.S. Treasury securities			161,617				—				(4,353	)			157,264
Municipal securities			23,480				21				(192	)			23,309
Mortgage-backed Agency securities			37,046				—				(2,189	)			34,857
Total			96,480				3				(13,049	)			83,434
		$	320,123			$	24			$	(19,798	)		$	300,349

Investments Classified by Contractual Maturity Date [Table Text Block]

(Amounts in thousands)		*U.S. Agency Securities*				*U.S. Treasury Securities*				*Municipal Securities*				*Corporate Notes*				*Total*
Amortized cost maturity:
One year or less		$	5,750			$	146,653			$	5,118			$	—			$	157,521
After one year through five years			—				—				14,410				28,566				42,976
After five years through ten years			—				—				—				—				—
After ten years			—				—				—				—				—
Amortized cost		$	5,750			$	146,653			$	19,528			$	28,566				200,497
Mortgage-backed securities																			94,548
Total amortized cost																		$	295,045

Fair value maturity:
One year or less		$	5,749			$	145,826			$	5,116			$	—			$	156,691
After one year through five years			—				—				14,261				27,081				41,342
After five years through ten years			—				—				—				—				—
After ten years			—				—				—				—				—
Fair value		$	5,749			$	145,826			$	19,377			$	27,081				198,033
Mortgage-backed securities																			82,928
Total fair value																		$	280,961

Gain (Loss) on Securities [Table Text Block]

		*December 31, 2023*
		*Less than 12 Months*								*12 Months or Longer*								*Total*
		*Fair*				*Unrealized*				*Fair*				*Unrealized*				*Fair*				*Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
(Amounts in thousands)
U.S. Agency securities		$	5,749			$	(1	)		$	—			$	—			$	5,749			$	(1	)
U.S. Treasury securities			11,417				(14	)			129,108				(829	)			140,525				(843	)
Municipal securities			4,742				(20	)			5,484				(142	)			10,226				(162	)
Corporate Notes			—				—				27,081				(1,485	)			27,081				(1,485	)
Mortgage-backed Agency securities			3,421				(10	)			78,319				(11,612	)			81,740				(11,622	)
Total		$	25,329			$	(45	)		$	239,992			$	(14,068	)		$	265,321			$	(14,113	)

		*December 31, 2022*
		*Less than 12 Months*								*12 Months or Longer*								*Total*
		*Fair*				*Unrealized*				*Fair*				*Unrealized*				*Fair*				*Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
(Amounts in thousands)
U.S. Agency securities		$	1,485			$	(15	)		$	—			$	—			$	1,485			$	(15	)
U.S. Treasury securities			157,264				(4,353	)			—				—				157,264				(4,353	)
Municipal securities			12,347				(192	)			—				—				12,347				(192	)
Corporate Notes			32,368				(2,172	)			2,489				(17	)			34,857				(2,189	)
Mortgage-backed Agency securities			64,993				(8,824	)			18,305				(4,225	)			83,298				(13,049	)
Total		$	268,457			$	(15,556	)		$	20,794			$	(4,242	)		$	289,251			$	(19,798	)