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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

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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