Note 12 - Earnings Per Share - Calculation of Basic and Diluted 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
Net income	$ 2,272	$ 2,017	$ 6,261	$ 4,785
Basic (in shares)	16,757,963	16,593,811	16,711,172	16,554,391
Plus: Common share equivalents (in shares)	19,708		17,680	1,763
Diluted weighted-average number of common shares outstanding (in shares)	16,777,671	16,593,811	16,728,852	16,556,154
Basic (in dollars per share)	$ 0.14	$ 0.12	$ 0.37	$ 0.29
Diluted (in dollars per share)	$ 0.14	$ 0.12	$ 0.37	$ 0.29