Note 9 - Earnings Per Common Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017
Earnings per common share, basic, weighted average common shares outstanding (in shares)	5,806,960	5,768,670	[1]	5,801,016	[1]	5,766,041	[1]
Earnings per common share, basic, net income	$ 973	$ 434		$ 2,163		$ 1,199
Earnings per common share, basic (in dollars per share)	$ 0.17	$ 0.08	[1]	$ 0.37	[1]	$ 0.21	[1]
Dilutive stock options, weighted average common shares outstanding (in shares)	45,798	21,235		45,798		21,235
Earnings per common share, diluted, weighted average common shares outstanding (in shares)	5,852,758	5,789,905	[1]	5,846,814	[1]	5,787,276	[1]
Earnings per common share, diluted, net income	$ 973	$ 434		$ 2,163		$ 1,119
Diluted earnings per common share (in dollars per share)	$ 0.17	$ 0.08	[1]	$ 0.37	[1]	$ 0.21	[1]
Earnings per common share, diluted (in dollars per share)	$ 0.17	$ 0.08	[1]	$ 0.37	[1]	$ 0.21	[1]

[1] Restated for the 4% stock dividend distributed July 11, 2016