Note 9 - Goodwill and Other Intangible Assets - Components of Other Intangible Assets, by Reporting Unit (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-lived intangible assets, net	$ 7,069
Other intangible assets	7,069	$ 8,519
Community Banking [Member]
Other intangible assets		8,519	$ 5,026
Core Deposits [Member]
Finite-lived intangible assets, gross	8,519
Accumulated amortization	(1,450)
Finite-lived intangible assets, net	7,069
Core Deposits [Member] | Highlands Bankshares, Inc. [Member]
Finite-lived intangible assets, gross	0	4,490	0
Core Deposits [Member] | Community Banking [Member]
Finite-lived intangible assets, gross		8,184	8,184
Accumulated amortization		(4,155)	(3,158)
Finite-lived intangible assets, net		8,519	5,026
Other Intangible Assets [Member]
Finite-lived intangible assets, gross	0
Accumulated amortization	0
Finite-lived intangible assets, net	$ 0
Other Intangible Assets [Member] | Community Banking [Member]
Finite-lived intangible assets, gross		0	535
Accumulated amortization		0	(535)
Finite-lived intangible assets, net		$ 0	$ 0