Note 18 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Requisite Service Period (Year)	1 year
Defined Benefit Plan, Accumulated Benefit Obligation	$ 5,014,000	$ 5,821,000	$ 6,262,000
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	$ 1,121,000	1,038,000	932,000
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year)	10 years
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 150,000	200,000
Deferred Compensation Arrangement with Individual, Compensation Expense	0	0	0
Profit Sharing and Deferred Compensation Arrangements Expense	184,000	0	158,000
Profit Sharing and Incentive Arrangements Expense	2,897,000	1,214,000	1,217,000
HomeTown Bankshares Corporation [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability	5,552,000	5,585,000
Deferred Compensation Arrangement with Individual, Compensation Expense	430,000	$ 422,000	$ 194,000
Minimum [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	25,000
Maximum [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 50,000