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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Due in one year or less, amortized cost	$ 98,215
Due in one year or less, fair value	96,968
Due after one year through five years, amortized cost	140,089
Due after one year through five years	138,343
Amortized cost, single maturity date, amortized cost	238,304
Fair value, single maturity date	235,311
Amortized cost	242,636	$ 156,750
Fair value	239,549	153,203
Residential Mortgage-Backed Securities [Member]
Amortized cost, without single maturity date, amortized cost	3,342
Fair value, without single maturity date	3,266
Amortized cost	3,342	3,431
Fair value	3,266	3,367
Collateralized Mortgage-Backed Securities [Member]
Amortized cost, without single maturity date, amortized cost	990
Fair value, without single maturity date	972
Amortized cost	990	1,023
Fair value	$ 972	$ 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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