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Note 3 - Investment Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 25,093
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	24,668
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	1,163
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	1,158
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	153,392
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	143,285
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	1,301
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	1,278
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	28,620
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	26,331
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	10,459
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	9,919
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	0
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	5,814
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	5,327
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	207,105
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	194,284
Debt Securities, Held-to-maturity, Amortized Cost	18,737
Debt Securities, Held-to-maturity, Fair Value	17,682
Debt Securities, Available-for-Sale, Amortized Cost	282,527	$ 304,805
Debt Securities, Available-for-Sale	262,622	276,601
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	18,737	16,863
Debt Securities, Held-to-Maturity, Fair Value	17,682	15,679
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Debt Securities, Available-for-Sale, Without Maturity, Amortized Cost	75,422
Debt Securities, Available-for-Sale, Without Maturity, Fair Value	68,338
Debt Securities, Held-to-maturity, without single maturity date, Amortized Cost	0
Debt Securities, Held-to-maturity, without single maturity date, Fair Value	0
Debt Securities, Available-for-Sale, Amortized Cost	75,422	81,634
Debt Securities, Available-for-Sale	$ 68,339	$ 72,790

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