Note 11 - 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, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income	$ 2,403	$ 2,549	$ 2,635	$ 1,850	$ 2,412	$ 2,019	$ 7,587	$ 6,281
Basic weighted-average number of common shares outstanding (in shares)	20,168,529			16,818,625			19,678,031	16,791,815
Plus: Common share equivalents (in shares)	3,753			19,922			5,491	22,133
Diluted weighted-average number of common shares outstanding (in shares)	20,172,282			16,838,547			19,683,522	16,813,948
Basic (in dollars per share)	$ 0.12			$ 0.11			$ 0.39	$ 0.37
Diluted (in dollars per share)	$ 0.12			$ 0.11			$ 0.39	$ 0.37