Note 9 - Goodwill and Other Intangible Assets - Components of Other Intangible Assets, by Reporting Unit (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Finite-lived intangible assets, net	$ 5,026
Other intangible assets	5,026	$ 6,151	[1]
Community Banking [Member]
Other intangible assets		6,151		$ 7,207
Core Deposits [Member]
Finite-lived intangible assets, gross	8,184
Accumulated amortization	(3,158)
Finite-lived intangible assets, net	5,026
Core Deposits [Member] | Community Banking [Member]
Finite-lived intangible assets, gross		8,184		11,536
Accumulated amortization		(2,161)		(4,515)
Finite-lived intangible assets, net		6,023		7,021
Other Intangible Assets [Member]
Finite-lived intangible assets, gross	535
Accumulated amortization	(535)
Finite-lived intangible assets, net
Other Intangible Assets [Member] | Community Banking [Member]
Finite-lived intangible assets, gross		879		3,508
Accumulated amortization		(751)		(3,322)
Finite-lived intangible assets, net		$ 128		$ 186

[1] Derived from audited financial statements