Note 13 - Income Taxes - Difference In Statutory Federal Income Tax Rate and Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statutory tax rate	21.00%	21.00%	21.00%
Tax exempt interest	(0.70%)	(0.90%)	(0.60%)
Tax exempt income on bank owned life insurance	(2.20%)	(1.60%)	(0.80%)
Captive insurance premium income	(1.50%)	(0.80%)	(0.90%)
Affordable housing tax credit limited partnerships	(2.00%)	(2.00%)	(0.80%)
Nondeductible merger-related expenses	0.90%	1.70%	0.00%
Other, net	0.00%	(0.20%)	0.00%
Effective tax rate	15.50%	17.20%	17.90%