Note 18 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Requisite Service Period (Year)	1 year
Defined Benefit Plan, Accumulated Benefit Obligation	$ 3,300,000	$ 5,000,000.0	$ 5,800,000
Defined Benefit Plan, Maximum Percentage of Limiting Equities	5.00%
Defined Contribution Plan, Employer Matching Contribution, Service Requirement (Year)	1 year
Defined Contribution Plan, Cost	$ 1,200,000	1,100,000	1,000,000.0
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year)	10 years
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 100,000	150,000
Deferred Compensation Arrangement with Individual, Compensation Expense	0	0	0
Profit Sharing and Deferred Compensation Arrangements Expense	86,000	184,000	0
Profit Sharing and Incentive Arrangements Expense	5,100,000	3,100,000	1,200,000
HomeTown Bankshares Corporation [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability	5,400,000	5,600,000
Deferred Compensation Arrangement with Individual, Compensation Expense	159,000	$ 430,000	$ 422,000
Minimum [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	25,000
Maximum [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 50,000