Note 23 - Parent Company Condensed Financial Information - 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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Dividends													$ 97	$ 78	$ 67
Loss on equity securities													(207)
Other operating expenses													(3,528)	(3,448)	(3,589)
Income tax benefit	$ (216)	$ (530)	$ (287)	$ (361)	$ (928)	$ (825)	$ (835)	$ (515)	$ (626)	$ (666)	$ (667)	$ (564)	(1,394)	(3,103)	(2,523)
Net income	$ 2,496	$ 2,524	$ 2,100	$ 2,133	$ 1,587	$ 2,109	$ 2,190	$ 1,553	$ 1,741	$ 1,758	$ 1,783	$ 1,582	9,253	7,439	6,864
Parent Company [Member]
Dividend income from subsidiaries													6,297	4,175	2,550
Dividends													16	4	152
Loss on equity securities													(207)
Other operating expenses													(587)	(383)	(534)
Income before income taxes and equity in undistributed net income of subsidiaries													5,519	3,796	2,168
Income tax benefit													210	147	158
Income before equity in undistributed net income of subsidiaries													(5,729)	(3,943)	(2,326)
Equity in undistributed net income of subsidiaries													(3,524)	(3,496)	(4,538)
Net income													$ 9,253	$ 7,439	$ 6,864