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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities available for sale, due within one year, amortized cost	$ 47,332
Securities available for sale, due within one year, fair value	47,266
Securities available for sale, due after one year but within five years, amortized cost	41,701
Securities available for sale, due after one year but within five years, fair value	39,836
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	89,033
Securities available for sale, single maturity date, fair value	87,102
Total debt securities available-for-sale	181,529	$ 295,045
Total debt securities available-for-sale	166,247	$ 280,961	[1]
Collateralized Mortgage-Backed Securities [Member]
Agency mortgage-backed securities, amortized cost	92,496
Agency mortgage-backed securities, fair value	$ 79,145
[1] Derived from audited financial statements

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