Note 9 - Goodwill and Other Intangible Assets - Components of Other Intangible Assets, by Reporting Unit (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-lived intangible assets, net	$ 8,519
Other intangible assets	8,519	$ 5,026
Community Banking [Member]
Other intangible assets		5,026	$ 6,151
Core Deposits [Member]
Finite-lived intangible assets, gross	8,184
Accumulated amortization	(4,155)
Finite-lived intangible assets, net	8,519
Core Deposits [Member] | Highlands Bankshares, Inc. [Member]
Finite-lived intangible assets, gross	4,490
Core Deposits [Member] | Community Banking [Member]
Finite-lived intangible assets, gross		8,184	8,184
Accumulated amortization		(3,158)	(2,161)
Finite-lived intangible assets, net		5,026	6,023
Core Deposits [Member] | Community Banking [Member] | Highlands Bankshares, Inc. [Member]
Finite-lived intangible assets, gross
Other Intangible Assets [Member]
Finite-lived intangible assets, gross
Accumulated amortization
Finite-lived intangible assets, net
Other Intangible Assets [Member] | Community Banking [Member]
Finite-lived intangible assets, gross		535	879
Accumulated amortization		(535)	(751)
Finite-lived intangible assets, net			$ 128