Note 15 - Employee Benefit Plans (Funded Status - Market Value of Plan Assets Divided by Funding Target) as of July 1 (Details)	Dec. 31, 2019	Dec. 31, 2018
Bank of Floyd Plan [Member]
Funded status (market value of plan assets divided by funding target) as of July 1	103.97%	106.44%

Percentage of plan assets to benefit obligation of defined benefit plan.

No definition available.

Name:	us-gaap_DefinedBenefitPlanFundedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant