Note 3 - Acquisition - Pro Forma Financial Information (Details) - Hometown Bancshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Summary of Operations
Net interest income	$ 7,972	$ 7,597	$ 15,716	$ 15,195
Provision for loan losses	500	437	725	875
Net interest income after provision for loan losses	7,472	7,160	14,991	14,320
Non interest income	1,954	1,753	3,574	3,505
Non interest expense	10,223	6,898	17,725	13,795
Income (loss) before income taxes	(797)	2,015	840	4,030
Provision (credit) for income taxes	(454)	680	(131)	1,360
Net income (loss)	$ (343)	$ 1,335	$ 971	$ 2,670
Basic income (loss) per common share (in dollars per share)	$ (0.08)	$ 0.31	$ 0.22	$ 0.61
Diluted income (loss) per common share (in dollars per share)	$ (0.08)	$ 0.30	$ 0.22	$ 0.60