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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Due in one year or less, amortized cost | $ 61,336 |
Due in one year or less, fair value | 60,324 |
Due after one year through five years, amortized cost | 152,043 |
Due after one year through five years | 144,936 |
Amortized cost, single maturity date, amortized cost | 213,379 |
Fair value, single maturity date | 205,260 |
Amortized cost | 218,599 | $ 85,585
Fair value | 210,338 | 85,694
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 3,997 |
Fair value, without single maturity date | 3,881 |
Amortized cost | 3,997 | 4,660
Fair value | 3,881 | 4,833
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 1,223 |
Fair value, without single maturity date | 1,197 |
Amortized cost | 1,223 | 1,576
Fair value | $ 1,197 | $ 1,580

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