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Note 2 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available for sale, due within one year, amortized cost	$ 19,591
Securities available for sale, due within one year, fair value	19,546
Securities available for sale, due after one year but within five years, amortized cost	26,553
Securities available for sale, due after one year but within five years, fair value	26,126
Securities available for sale, single maturity date, amortized cost	46,144
Securities available for sale, single maturity date, fair value	45,672
Total debt securities available-for-sale, amortized cost	142,206	$ 184,687
Total debt securities available-for-sale, fair value	131,314	$ 169,849	[1]
Collateralized Mortgage-Backed Securities [Member]
Agency mortgage-backed securities, amortized cost	96,062
Agency mortgage-backed securities, fair value	$ 85,642
[1] Derived from audited financial statements

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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), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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