Note 8 - Deposits - Public Entity Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Collateralized by investment securities	$ 3,877	$ 6,350
U.S. govt. sponsored agency securities.
Collateralized by investment securities	2,081	3,080
Residential mortgage-backed and related securities
Collateralized by investment securities	$ 1,796	$ 3,270