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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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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