Note 9 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net income as reported	$ 3,192	$ 2,222
Weighted average common shares outstanding (in shares)	3,458,505	3,343,183
Basic earnings per common share (in dollars per share)	$ 0.92	$ 0.66
Add: Dilutive effect of assumed stock option exercises (in shares)
Weighted average common and dilutive potential common shares outstanding (in shares)	3,458,505	3,343,183
Diluted earnings per common share (in dollars per share)	$ 0.92	$ 0.66