Note 13 - Segment Reporting - Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Net interest income	$ 6,919	$ 6,661
Provision for loan losses	515	167
Total non-interest income	1,167	989
Total non-interest expense	7,037	7,066
Income before income taxes	534	417
Provision for income taxes	130	100
Net income	404	317
Total assets	619,827	575,582	$ 606,892
Total investment securities	213,497	231,466
Total loans, net	317,677	263,975	322,772
Investment in subsidiaries	5	5
Fixed asset additions	4,087	3,229
Depreciation and amortization expense	242	232
Total interest income from external customers	7,510	7,196
Total interest income from affiliates
Intersegment Eliminations [Member]
Net interest income
Provision for loan losses
Total non-interest income	(763)	(659)
Total non-interest expense	(170)	(135)
Income before income taxes	(593)	(524)
Provision for income taxes
Net income	(593)	(524)
Total assets	(173,601)	(169,845)
Total investment securities
Total loans, net	(76,509)	(72,542)
Investment in subsidiaries	(76,976)	(77,716)
Fixed asset additions
Depreciation and amortization expense
Total interest income from external customers
Total interest income from affiliates	(1,117)	(1,015)
FUSB [Member]
Provision for loan losses			885
Total loans, net	232,916		237,242
FUSB [Member] | Operating Segments [Member]
Net interest income	3,911	3,598
Provision for loan losses		(280)
Total non-interest income	836	721
Total non-interest expense	4,401	4,334
Income before income taxes	346	265
Provision for income taxes	98	48
Net income	248	217
Total assets	622,528	577,945
Total investment securities	213,417	231,386
Total loans, net	309,425	256,037
Investment in subsidiaries	5	5
Fixed asset additions	4,025	3,224
Depreciation and amortization expense	201	180
Total interest income from external customers	3,392	3,124
Total interest income from affiliates	1,114	1,012
ALC [Member]
Provision for loan losses	515		2,311
Total loans, net	84,761		$ 85,530
ALC [Member] | Operating Segments [Member]
Net interest income	3,005	3,060
Provision for loan losses	515	447
Total non-interest income	244	252
Total non-interest expense	2,377	2,427
Income before income taxes	357	438
Provision for income taxes	130	158
Net income	227	280
Total assets	88,233	84,353
Total investment securities
Total loans, net	84,761	80,480
Investment in subsidiaries
Fixed asset additions	62	5
Depreciation and amortization expense	41	52
Total interest income from external customers	4,118	4,072
Total interest income from affiliates
Other Segments [Member] | Operating Segments [Member]
Net interest income	3	3
Provision for loan losses
Total non-interest income	850	675
Total non-interest expense	429	440
Income before income taxes	424	238
Provision for income taxes	(98)	(106)
Net income	522	344
Total assets	82,667	83,129
Total investment securities	80	80
Total loans, net
Investment in subsidiaries	76,976	77,716
Fixed asset additions
Depreciation and amortization expense
Total interest income from external customers
Total interest income from affiliates	$ 3	$ 3