Note 2 - Securities - Debt Securities by Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Due in one year or less, amortized cost	$ 57,724
Due in one year or less, fair value	56,289
Due from one to five years, amortized cost	261,591
Due from one to five years, fair value	241,758
Due from five to ten years, amortized cost	279,722
Due from five to ten years, fair value	243,791
Due after ten years, amortized cost	46,293
Due after ten years, fair value	45,281
Total, amortized cost	680,998	$ 685,646
Fair value	617,092	602,936
Collateralized Mortgage-Backed Securities [Member]
No single maturity, amortized cost	35,168
No single maturity, fair value	29,473
Total, amortized cost	35,168	38,002
Fair value	29,473	31,953
Other Debt and Equity Securities [Member]
No single maturity, amortized cost	500
No single maturity, fair value	500
Total, amortized cost	500	500
Fair value	$ 500	$ 500