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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities available for sale, due within one year, amortized cost	$ 157,238
Securities available for sale, due within one year, fair value	155,191
Securities available for sale, due after one year but within five years, amortized cost	43,357
Securities available for sale, due after one year but within five years, fair value	40,550
Securities available for sale, due after five years but within ten years, amortized cost	594
Securities available for sale, due after five years but within ten years, fair value	570
Securities available for sale, single maturity date, amortized cost	201,189
Securities available for sale, single maturity date, fair value	196,311
Total debt securities available for sale, amortized cost	297,291	$ 320,123
Total debt securities available for sale	275,332	$ 300,349	[1]
Collateralized Mortgage-Backed Securities [Member]
Agency mortgage-backed securities, amortized cost	96,102
Agency mortgage-backed securities, fair value	$ 79,021
[1] Derived from audited financial statements

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