Note 15 - Income Taxes - Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate From Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal income tax at the statutory rate, amount									$ 9,683	$ 10,457	$ 9,475
Federal income tax at the statutory rate									21.00%	21.00%	21.00%
State income tax, net of federal benefit, amount									$ 1,109	$ 1,220	$ 1,016
State income tax, net of federal benefit									3.12%	3.12%	2.25%
Total effective income tax rate reconciliation, amount									$ 10,792	$ 11,677	$ 10,491
Total effective income tax rate reconciliation									24.12%	24.12%	23.25%
Tax-exempt interest income, amount									$ (500)	$ (637)	$ (702)
Tax-exempt interest income									(1.51%)	(1.28%)	(1.56%)
Nondeductible goodwill impairment and disposition, amount									$ 0	$ 0	$ 569
Nondeductible goodwill impairment and disposition									0.00%	0.00%	1.26%
Bank owned life insurance, amount									$ (139)	$ (249)	$ (144)
Bank owned life insurance									(0.42%)	(0.50%)	(0.32%)
Deferred tax revaluation, amount									$ 0	$ (98)	$ (1,669)
Deferred tax revaluation									0.00%	(0.20%)	(3.70%)
Other items, net, amount									$ 33	$ 301	$ 237
Other items, net									(0.10%)	0.10%	0.53%
Total income tax expense	$ 3,389	$ 2,332	$ 2,270	$ 2,195	$ 2,833	$ 2,580	$ 2,951	$ 2,630	$ 10,186	$ 10,994	$ 8,782
Income tax at the effective tax rate									22.09%	22.24%	19.46%