Note 6 - Goodwill and Intangible Assets (Details Textual)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 01, 2018 USD ($)
Business Acquisition Number of Acquisitions Resulting in Goodwill	5
Goodwill, Ending Balance	$ 19,448,000	$ 10,288,000
Goodwill, Impairment Loss	$ 0	0
Business Acquisition, Number of Acquisitions Resulting in Intangible Assets	3
Amortization of Intangible Assets, Total	$ 266,000	$ 246,000
Community First [Member]
Goodwill, Ending Balance	$ 9,200,000		$ 9,161,000