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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Due in one year or less, amortized cost | $ 135,578 |
Due in one year or less, fair value | 134,776 |
Due after one year through five years, amortized cost | 126,555 |
Due after one year through five years | 126,252 |
Amortized cost, single maturity date, amortized cost | 262,133 |
Fair value, single maturity date | 261,028 |
Amortized cost | 266,043 | $ 156,750
Fair value | 264,905 | 153,203
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 3,011 |
Fair value, without single maturity date | 2,989 |
Amortized cost | 3,011 | 3,431
Fair value | 2,989 | 3,367
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 899 |
Fair value, without single maturity date | 888 |
Amortized cost | 899 | 1,023
Fair value | $ 888 | $ 1,003

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