Note 15 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%	100.00%
Bank of Floyd Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 64	$ 54
Fixed Income Securities [Member] | Mutual Fund [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	48.00%	52.00%
Equity Securities [Member] | Mutual Fund [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	52.00%	48.00%