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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Due in one year or less, amortized cost | $ 86,502 |
Due in one year or less, fair value | 84,770 |
Due after one year through five years, amortized cost | 84,946 |
Due after one year through five years | 80,187 |
Amortized cost, single maturity date, amortized cost | 171,448 |
Fair value, single maturity date | 164,957 |
Amortized cost | 176,293 | $ 218,599
Fair value | 169,647 | 210,338
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 3,730 |
Fair value, without single maturity date | 3,597 |
Amortized cost | 3,730 | 3,997
Fair value | 3,597 | 3,881
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 1,115 |
Fair value, without single maturity date | 1,093 |
Amortized cost | 1,115 | 1,223
Fair value | $ 1,093 | $ 1,197

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