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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities available for sale, due within one year, amortized cost	$ 15,364
Securities available for sale, due within one year, fair value	15,321
Securities available for sale, due after one year but within five years, amortized cost	39,954
Securities available for sale, due after one year but within five years, fair value	38,122
Securities available for sale, due after five years but within ten years, amortized cost	0
Securities available for sale, due after five years but within ten years, fair value	0
Securities available for sale, single maturity date, amortized cost	55,318
Securities available for sale, single maturity date, fair value	53,443
Total debt securities available-for-sale	145,622	$ 295,045
Total debt securities available-for-sale	129,686	$ 280,961	[1]
Collateralized Mortgage-Backed Securities [Member]
Agency mortgage-backed securities, amortized cost	90,304
Agency mortgage-backed securities, fair value	$ 76,243
[1] Derived from audited financial statements

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