Note 12 - Earnings Per Common Share - Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted average number of common shares outstanding used in basic earnings per share calculation (in shares)	4,628	4,614	4,624	4,606
Restricted stock awards and options (in shares)	23	28	26	29
Weighted average number of shares outstanding adjusted for effect of dilutive securities (in shares)	4,651	4,642	4,650	4,635
Net income	$ 3,101	$ 2,076	$ 7,177	$ 6,557
Basic earnings per share (in dollars per share)	$ 0.67	$ 0.45	$ 1.55	$ 1.42
Diluted earnings per share (in dollars per share)	$ 0.67	$ 0.45	$ 1.54	$ 1.41