Note 14 - Segment Reporting - Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Net interest income	$ 9,233	$ 7,502	$ 7,502	$ 18,406	$ 14,816
Provision for loan losses	715	702	702	1,115	1,360	$ 2,622
Total non-interest income	1,291	1,132	1,132	2,556	2,272
Total non-interest expense	8,504	7,492	7,492	16,957	14,793
Income before income taxes	1,305	440	440	2,890	935
Provision for income taxes	300	81	81	651	162
Net income	1,005	359	359	2,239	773
Total assets	777,171	634,036	634,036	777,171	634,036	791,939
Total investment securities	136,649	165,740	165,740	136,649	165,740
Total loans, net	511,515	355,529	355,529	511,515	355,529	514,867
Goodwill and core deposit intangible, net	9,056			9,056		9,312
Investment in subsidiaries	5	5	5	5	5
Fixed asset additions	951		494	2,642	715
Depreciation and amortization expense	396		353	796	704
Total interest income from external customers	10,923		8,390	21,736	16,509
Total interest income from affiliates
Intersegment Eliminations [Member]
Net interest income
Provision for loan losses
Total non-interest income	(1,429)		(772)	(3,042)	(1,608)
Total non-interest expense	(153)		(187)	(328)	(388)
Income before income taxes	(1,276)		(585)	(2,714)	(1,220)
Provision for income taxes
Net income	(1,276)		(585)	(2,714)	(1,220)
Total assets	(198,094)	(187,343)	(187,343)	(198,094)	(187,343)
Total investment securities
Total loans, net	(93,669)	(90,936)	(90,936)	(93,669)	(90,936)
Goodwill and core deposit intangible, net
Investment in subsidiaries	(83,436)	(75,241)	(75,241)	(83,436)	(75,241)
Fixed asset additions
Depreciation and amortization expense
Total interest income from external customers
Total interest income from affiliates	(1,213)		(1,158)	(2,379)	(2,251)
FUSB [Member]
Provision for loan losses				90		215
Total loans, net	407,508			407,508		414,430
FUSB [Member] | Operating Segments [Member]
Net interest income	5,986		4,244	11,995	8,361
Provision for loan losses	90			90	39
Total non-interest income	1,108		948	2,186	1,815
Total non-interest expense	5,798		4,888	11,631	9,419
Income before income taxes	1,206		304	2,460	718
Provision for income taxes	249		60	511	130
Net income	957		244	1,949	588
Total assets	778,252	636,623	636,623	778,252	636,623
Total investment securities	136,569	165,660	165,660	136,569	165,660
Total loans, net	501,177	345,673	345,673	501,177	345,673
Goodwill and core deposit intangible, net	9,056			9,056
Investment in subsidiaries	5	5	5	5	5
Fixed asset additions	887		439	2,564	658
Depreciation and amortization expense	361		321	728	639
Total interest income from external customers	6,476		3,983	12,969	7,820
Total interest income from affiliates	1,206		1,154	2,367	2,243
ALC [Member]
Provision for loan losses				1,025		2,407
Total loans, net	104,007			104,007		$ 100,437
ALC [Member] | Operating Segments [Member]
Net interest income	3,240		3,254	6,398	6,447
Provision for loan losses	625		702	1,025	1,321
Total non-interest income	228		272	447	528
Total non-interest expense	2,366		2,426	4,734	4,950
Income before income taxes	477		398	1,086	704
Provision for income taxes	121		82	264	152
Net income	356		316	822	552
Total assets	107,911	103,624	103,624	107,911	103,624
Total investment securities
Total loans, net	104,007	100,792	100,792	104,007	100,792
Goodwill and core deposit intangible, net
Investment in subsidiaries
Fixed asset additions	64		55	78	57
Depreciation and amortization expense	35		32	68	65
Total interest income from external customers	4,447		4,407	8,766	8,689
Total interest income from affiliates
Other Segments [Member] | Operating Segments [Member]
Net interest income	7		4	13	8
Provision for loan losses
Total non-interest income	1,384		684	2,965	1,537
Total non-interest expense	493		365	920	812
Income before income taxes	898		323	2,058	733
Provision for income taxes	(70)		(61)	(124)	(120)
Net income	968		384	2,182	853
Total assets	89,102	81,132	81,132	89,102	81,132
Total investment securities	80	80	80	80	80
Total loans, net
Goodwill and core deposit intangible, net
Investment in subsidiaries	83,436	$ 75,241	75,241	83,436	75,241
Fixed asset additions
Depreciation and amortization expense
Total interest income from external customers				1
Total interest income from affiliates	$ 7		$ 4	$ 12	$ 8