Note 15 - Financial Instrument Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments And Contingencies Disclosure [Line Items]
Total financial instrument commitments	$ 397,774	$ 358,824
Commitments to Extend Credit [Member]
Commitments And Contingencies Disclosure [Line Items]
Total financial instrument commitments	378,954	339,312
Standby Letters of Credit [Member]
Commitments And Contingencies Disclosure [Line Items]
Total financial instrument commitments	$ 18,820	$ 19,512