Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)	1 Months Ended	9 Months Ended		52 Months Ended
	Jul. 31, 2011	Sep. 30, 2021	Sep. 30, 2020	Apr. 30, 2019
Goodwill, Impairment Loss		$ 0	$ 0
MidCarolina Financial Corporation [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 6,556,000
Finite-Lived Intangible Asset, Useful Life (Month)	108 months
MainStreet BancShares, Inc and HomeTown Bankshares Corporation [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 10,039,000
Finite-Lived Intangible Asset, Useful Life (Month)				120 months