Note 9 - Deposits - Public Entity Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Collateralized by investment securities	$ 3,919	$ 3,877
U.S. govt. sponsored agency securities
Collateralized by investment securities	1,805	2,081
Residential mortgage-backed and related securities
Collateralized by investment securities	$ 2,114	$ 1,796