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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost | $ 266,043 | $ 156,750
Gross unrealized gains | 120 | 46
Gross unrealized losses | (1,258) | (3,593)
Fair value | 264,905 | 153,203
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 928 | 930
Gross unrealized gains | 10 | 12
Gross unrealized losses | (1) | (8)
Fair value | 937 | 934
US Treasury Securities [Member] |  |
Amortized cost | 123,307 | 115,920
Gross unrealized gains | 24 | 0
Gross unrealized losses | (1,065) | (3,412)
Fair value | 122,266 | 112,508
US Government-sponsored Enterprises Debt Securities [Member] |  |
Amortized cost | 137,898 | 35,446
Gross unrealized gains | 56 | 7
Gross unrealized losses | (129) | (62)
Fair value | 137,825 | 35,391
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 3,011 | 3,431
Gross unrealized gains | 30 | 27
Gross unrealized losses | (52) | (91)
Fair value | 2,989 | 3,367
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost | 899 | 1,023
Gross unrealized gains | 0 | 0
Gross unrealized losses | (11) | (20)
Fair value | $ 888 | $ 1,003

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