Note 16 - Income Taxes - Reconciliation Statutory Income Tax Rates (Details)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Applicable statutory rate	21.00%	21.00%
Tax-exempt interest and dividends, net	(1.80%)	(1.40%)
State income taxes, net of Federal income tax benefit	1.80%	1.90%
Low-income housing and rehabilitation tax credits	(0.30%)	(0.20%)
Other, net	(0.50%)	0.50%
Effective income tax rate	20.20%	21.80%