Note 19 - Parent Company Financial Information - Statements of Income, Comprehensive Income (Loss), and Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income	$ 19,914	$ 19,382	$ 19,371	$ 19,140	$ 19,980	$ 19,146	$ 18,662	$ 18,116	$ 77,807	$ 75,904	$ 62,065
Net loss before taxes									(4,850)	10,205	5,986
Provision (benefit) for income taxes	(1,031)	(516)	105	92	54	622	530	372	(1,350)	1,578	(2,919)
Net (loss) income	(2,485)	$ (1,822)	$ 381	426	2,157	$ 2,322	$ 2,371	1,777	(3,500)	8,627	8,905
Other comprehensive loss, net of tax									4,586	(2,778)	(215)
Total comprehensive income									1,086	5,849	8,690
Balance				245,189				226,460	245,189	226,460	215,053
Stock based compensation									2,632	2,116	1,842
Options exercised									261	670	646
Conversion of subordinated debt to common shares										10,094	229
Balance	249,168				245,189				249,168	245,189	226,460
Parent Company [Member]
Interest income									14	13	37
Total income									14	13	37
Trust preferred interest expense									476	441	1,225
Other expenses									3,662	4,972	1,424
Total expenses									4,138	5,413	2,649
Net loss before taxes									(4,124)	(5,400)	(2,612)
Provision (benefit) for income taxes									(917)	(1,640)	(914)
Loss before undistributed income of subsidiaries									(3,207)	(3,760)	(1,698)
Equity in undistributed income of subsidiaries									(293)	12,387	10,603
Net (loss) income									(3,500)	8,627	8,905
Other comprehensive loss, net of tax									4,586	(2,778)	(215)
Total comprehensive income									1,086	5,849	8,690
Balance				$ 245,189				$ 226,460	245,189	226,460	215,053
Stock based compensation									2,632	2,116	1,842
Options exercised									261	670	646
Conversion of subordinated debt to common shares										10,094	229
Balance	$ 249,168				$ 245,189				$ 249,168	$ 245,189	$ 226,460