Note 3 - Investments - Schedule of Securities Pledged as Collateral (Details) - Asset Pledged as Collateral [Member] $ in Thousands	Dec. 31, 2023 USD ($)
Investment Securities, Cost	$ 116,747
Investment Securities, Amortized Cost	135,884
Investment Securities, Fair Value	116,747
State and Local Government Public Deposits [Member]
Investment Securities, Cost	39,704
Investment Securities, Amortized Cost	45,689
Investment Securities, Fair Value	39,704
Federal Reserve Bank, Bank Term Funding Program [Member]
Investment Securities, Cost	77,043
Investment Securities, Amortized Cost	90,195
Investment Securities, Fair Value	$ 77,043