Note 9 - Earnings Per Common Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings per common share, basic (in shares)	5,770,175	5,763,944	5,767,602	4,279,821
Earnings per common share, basic	$ 917	$ 903	$ 2,116	$ 1,520
Earnings per common share, basic (in dollars per share)	$ 0.16	$ 0.16	$ 0.37	$ 0.36
Convertible preferred stock (in shares)				1,486,669
Convertible preferred stock (in dollars per share)				$ (0.10)
Dilutive stock options (in shares)	24,602	10,142	24,602	10,142
Earnings per common share, diluted (in shares)	5,794,777	5,774,086	5,792,204	5,776,632
Earnings per common share, diluted	$ 917	$ 903	$ 2,116	$ 1,520
Earnings per common share, diluted (in dollars per share)	$ 0.16	$ 0.16	$ 0.37	$ 0.26