Note 26 - Parent Company Financial Statements - Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other income									$ 445	$ 461	$ 636
Total income	$ 1,132	$ 943	$ 962	$ 982	$ 1,282	$ 1,076	$ 995	$ 1,471	4,019	4,824	3,486
Interest expense									5,155	4,587	4,778
Noninterest expense	8,868	7,634	7,671	8,033	7,891	7,357	7,726	7,990	32,206	30,964	32,500
Income before income taxes and equity in undistributed net income of subsidiaries	4,758	5,436	4,871	4,294	3,810	4,303	3,144	3,015	19,359	14,272	7,217
Income tax expense	$ (81)	$ 1,404	$ 1,253	$ 1,053	$ 3,803	$ 1,427	$ 935	$ 763	3,629	6,928	1,958
Net income									15,730	7,344	5,259
Parent Company [Member]
Other income									12	9	7
Dividends from subsidiaries									4,000	2,200	4,200
Total income									4,012	2,209	4,207
Management fees paid to subsidiaries									303	278	259
Interest expense									1,461	1,452	1,409
Noninterest expense									1,433	474	345
Total expenses									3,197	2,204	2,013
Income before income taxes and equity in undistributed net income of subsidiaries									815	5	2,194
Income tax expense									1	1	1
Income before equity in undistributed net income of subsidiaries									814	4	2,193
Equity in undistributed net income of subsidiaries									14,916	7,340	3,066
Net income									$ 15,730	$ 7,344	$ 5,259