Note 2 - Acquisition - Pro Forma Financial Information (Details) - Hometown Bancshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of Operations
Net interest income	$ 35,031	$ 30,389
Provision for loan losses	1,225	1,750
Net interest income after provision for loan losses	33,806	28,639
Non interest income	6,853	7,011
Non interest expense	31,485	27,591
Income before income taxes	9,174	8,059
Provision for income taxes	1,884	2,720
Net income	$ 7,290	$ 5,339
Basic income per common share (in dollars per share)	$ 1.66	$ 1.22
Diluted income per common share (in dollars per share)	$ 1.63	$ 1.20