Note 2 - Securities - Debt Securities by Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Due in one year or less, amortized cost	$ 53,520
Due in one year or less, fair value	52,568
Due from one to five years, amortized cost	329,740
Due from one to five years, fair value	301,553
Due from five to ten years, amortized cost	227,431
Due from five to ten years, fair value	196,189
Due after ten years, amortized cost	30,958
Due after ten years, fair value	30,561
Total, amortized cost	676,208	$ 680,998
Fair value	609,153	617,092
Collateralized Mortgage-Backed Securities [Member]
No single maturity, amortized cost	34,059
No single maturity, fair value	27,782
Total, amortized cost	34,059	35,168
Fair value	27,782	29,473
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