Note 3 - Investment Securities - Rating for Held to Maturity Securities (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Dec. 31, 2024
Held to maturity securities		$ 21,207
US States and Political Subdivisions Debt Securities [Member]
Held to maturity securities	[1]	21,207	$ 20,559
Standard & Poor's, AAA Rating [Member] | US States and Political Subdivisions Debt Securities [Member]
Held to maturity securities		2,816	2,803
Standard & Poor's, AA Rating [Member] | US States and Political Subdivisions Debt Securities [Member]
Held to maturity securities		12,443	12,603
Standard & Poor's, A Rating [Member] | US States and Political Subdivisions Debt Securities [Member]
Held to maturity securities		1,202	1,811
Not Rated [Member] | US States and Political Subdivisions Debt Securities [Member]
Held to maturity securities		$ 4,746	$ 3,342

[1] Exluded from the amortized cost of securities available for sale are basis adjustments for securities designated in active fair value hedges. Basis adjustments totaled $222 thousand and ($556) thousand as of September 30, 2025 and December 31, 2024, respectively.