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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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