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Note 23 - Quarterly Data (Unaudited) - Summary of Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Interest income	$ 7,721	$ 7,760	$ 7,478	$ 7,196	$ 7,513	$ 7,328	$ 7,735	$ 7,321	$ 30,155	$ 29,897
Interest expense	588	587	561	535	549	561	565	614	2,271	2,289
Net interest income	7,133	7,173	6,917	6,661	6,964	6,767	7,170	6,707	27,884	27,608
Provision for loan losses	1,814	680	536	167	415	(78)	45	(166)	3,197	216
Net interest income after provision (reduction in reserve) for loan losses	5,319	6,493	6,381	6,494	6,549	6,845	7,125	6,873	24,687	27,392
Non-interest income:
Income	1,165	1,567	1,480	989	1,176	996	1,068	1,291	5,201	4,531
Expense	6,826	7,348	7,255	7,066	7,203	7,090	7,107	6,977	28,495	28,377
Income (loss) before income taxes	(342)	712	606	417	522	751	1,086	1,187
Provision for (benefit from) income taxes	(237)	162	144	100	81	207	312	351	169	951
Net income	$ (105)	$ 550	$ 462	$ 317	$ 441	$ 544	$ 774	$ 836	$ 1,224	$ 2,595
Earnings per common share:
Basic net income per share (in dollars per share)	$ (0.02)	$ 0.09	$ 0.08	$ 0.05	$ 0.07	$ 0.09	$ 0.13	$ 0.14	$ 0.20	$ 0.42
Diluted net income per share (in dollars per share)	$ (0.02)	$ 0.09	$ 0.07	$ 0.05	$ 0.07	$ 0.09	$ 0.12	$ 0.13	$ 0.19	$ 0.41

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