Note 14 - Income Taxes - Summary of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Expected federal tax expense	$ 11,600	$ 7,808	$ 5,411
Nondeductible interest expense	8	31	67
Tax-exempt interest	(198)	(259)	(478)
State income taxes	326	207	149
Other, net	(23)	(650)	(288)
Total income tax expense	$ 11,713	$ 7,137	$ 4,861