Note 19 - Segment Reporting - Results for Reportable Segments (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
Total interest income	$ 11,177	$ 9,452	$ 8,390	$ 8,119	$ 8,087	$ 7,820	$ 7,683	$ 7,510	$ 37,138	$ 31,100
Total interest expense	1,533	1,124	888	805	804	685	626	591	4,350	2,706
Net interest income	9,644	8,328	7,502	7,314	7,283	7,135	7,057	6,919	32,788	28,394
Provision for loan and lease losses	473	789	702	658	523	373	576	515	2,622	1,987
Net interest income after provision	9,171	7,539	6,800	6,656	6,760	6,762	6,481	6,404	30,166	26,407
Total non-interest income	1,158	2,112	1,132	1,140	1,333	1,236	930	1,167	5,542	4,666
Total non-interest expense	8,382	9,142	7,492	7,301	7,359	7,190	6,863	7,037	32,317	28,449
Income (loss) before income taxes									3,391	2,624
Provision for income taxes	470	269	81	81	2,600	173	132	130	901	3,035
Net income (loss)	1,477	$ 240	$ 359	$ 414	(1,866)	$ 635	$ 416	$ 404	2,490	(411)
Total assets	791,939				625,581				791,939	625,581
Total investment securities	153,949				180,150				153,949	180,150
Total loans, net	514,867				346,121				514,867	346,121
Goodwill and core deposit intangible, net	9,312								9,312
Investment in subsidiaries	5				5				5	5
Fixed asset additions									1,549	10,393
Depreciation and amortization expense									1,455	1,133
Total interest income from external customers									37,138	31,100
Total interest income from affiliates
Intersegment Eliminations [Member]
Total interest income									(4,663)	(4,901)
Total interest expense									(4,663)	(4,901)
Net interest income
Provision for loan and lease losses
Net interest income after provision
Total non-interest income									(4,170)	(885)
Total non-interest expense									(852)	(649)
Income (loss) before income taxes									(3,318)	(236)
Provision for income taxes
Net income (loss)									(3,318)	(236)
Total assets	(189,795)				(178,613)				(189,795)	(178,613)
Total investment securities
Total loans, net	(91,116)				(82,483)				(91,116)	(82,483)
Goodwill and core deposit intangible, net
Investment in subsidiaries	(79,191)				(75,725)				(79,191)	(75,725)
Fixed asset additions
Depreciation and amortization expense
Total interest income from external customers
Total interest income from affiliates									(4,663)	(4,901)
FUSB [Member]
Provision for loan and lease losses									215	(130)
Total loans, net	414,430				254,682				414,430	254,682
FUSB [Member] | Operating Segments [Member]
Total interest income									24,080	19,121
Total interest expense									4,367	2,719
Net interest income									19,713	16,402
Provision for loan and lease losses									215
Net interest income after provision									19,498	16,532
Total non-interest income									4,678	3,491
Total non-interest expense									21,791	18,096
Income (loss) before income taxes									2,385	1,927
Provision for income taxes									704	2,365
Net income (loss)									1,681	(438)
Total assets	793,530				628,260				793,530	628,260
Total investment securities	153,871				180,070				153,871	180,070
Total loans, net	505,546				337,165				505,546	337,165
Goodwill and core deposit intangible, net	9,312								9,312
Investment in subsidiaries	5				5				5	5
Fixed asset additions									1,388	9,107
Depreciation and amortization expense									1,311	971
Total interest income from external customers									19,434	14,233
Total interest income from affiliates									4,646	4,888
ALC [Member]
Provision for loan and lease losses									2,407	2,117
Total loans, net	100,437				91,439				100,437	91,439
ALC [Member] | Operating Segments [Member]
Total interest income									17,703	16,866
Total interest expense									4,646	4,888
Net interest income									13,057	11,978
Provision for loan and lease losses									2,407
Net interest income after provision									10,650	9,861
Total non-interest income									1,081	1,006
Total non-interest expense									9,770	9,524
Income (loss) before income taxes									1,961	1,343
Provision for income taxes									430	953
Net income (loss)									1,531	390
Total assets	103,067				94,488				103,067	94,488
Total investment securities
Total loans, net	100,437				91,439				100,437	91,439
Goodwill and core deposit intangible, net
Investment in subsidiaries
Fixed asset additions									161	109
Depreciation and amortization expense									144	162
Total interest income from external customers									17,703	16,866
Total interest income from affiliates
Other Segments [Member] | Operating Segments [Member]
Total interest income									18	14
Total interest expense
Net interest income									18	14
Provision for loan and lease losses
Net interest income after provision									18	14
Total non-interest income									3,953	1,054
Total non-interest expense									1,608	1,478
Income (loss) before income taxes									2,363	(410)
Provision for income taxes									(233)	(283)
Net income (loss)									2,596	(127)
Total assets	85,137				81,446				85,137	81,446
Total investment securities	78				80				78	80
Total loans, net
Goodwill and core deposit intangible, net
Investment in subsidiaries	$ 79,191				$ 75,725				79,191	75,725
Fixed asset additions
Depreciation and amortization expense
Total interest income from external customers									1	1
Total interest income from affiliates									$ 17	$ 13