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Note 3 - Debt Securities (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

		*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
Corporate Notes			37,046				—				(2,189	)			34,857
Mortgage-backed Agency securities			96,480				3				(13,049	)			83,434
Total		$	320,123			$	24			$	(19,798	)		$	300,349

		*December 31, 2021*
		*Amortized*				*Unrealized*				*Unrealized*				*Fair*
		*Cost*				*Gains*				*Losses*				*Value*
(Amounts in thousands)
U.S. Agency securities		$	469			$	—			$	(3	)		$	466
Municipal securities			28,596				198				—				28,794
Mortgage-backed Agency securities			9,935				—				(16	)			9,919
Total			37,273				513				(673	)			37,113
		$	76,273			$	711			$	(692	)		$	76,292

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		$	1,500			$	32,013			$	3,070			$	8,510			$	45,093
After one year through five years			—				129,604				17,626				28,536				175,766
After five years through ten years			—				—				2,784				—				2,784
After ten years			—				—				—				—				—
Amortized cost		$	1,500			$	161,617			$	23,480			$	37,046				223,643
Mortgage-backed securities																			96,480
Total amortized cost																		$	320,123

Fair value maturity:
One year or less		$	1,485			$	31,786			$	3,068			$	8,448			$	44,787
After one year through five years			—				125,478				17,467				26,409				169,354
After five years through ten years			—				—				2,774				—				2,774
After ten years			—				—				—				—				—
Fair value		$	1,485			$	157,264			$	23,309			$	34,857				216,915
Mortgage-backed securities																			83,434
Total fair value																		$	300,349

Schedule of Unrealized Loss on Investments [Table Text Block]

		*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	)

		*December 31, 2021*
		*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		$	—			$	—			$	459			$	(3	)		$	459			$	(3	)
Municipal securities			—				—				—				—				—				—
Corporate Notes			9,919				(16	)			—				—				9,919				(16	)
Mortgage-backed Agency securities			14,092				(253	)			8,384				(420	)			22,476				(673	)
Total		$	24,011			$	(269	)		$	8,843			$	(423	)		$	32,854			$	(692	)