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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Due in one year or less, amortized cost | $ 1,400 |
Due in one year or less, fair value | 1,399 |
Due after one year through five years, amortized cost | 129,279 |
Due after one year through five years | 125,236 |
Amortized cost, single maturity date, amortized cost | 130,679 |
Fair value, single maturity date | 126,635 |
Amortized cost | 136,590 | $ 85,585
Fair value | 132,634 | 85,694
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 4,448 |
Fair value, without single maturity date | 4,538 |
Amortized cost | 4,448 | 4,660
Fair value | 4,538 | 4,833
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 1,463 |
Fair value, without single maturity date | 1,461 |
Amortized cost | 1,463 | 1,576
Fair value | $ 1,461 | $ 1,580

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