Note 2 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income	$ 2,174	$ 1,190
Less: Preferred stock dividends
Net income available to common stockholders	$ 2,174	$ 1,190
Average common shares outstanding - basic (in shares)	2,721,212	2,708,712
Add: Dilutive effects of restricted stock awards (in shares)	18,977	14,898
Average shares and dilutive potential common shares (in shares)	2,740,189	2,723,610
Basic earnings per common share (in dollars per share)	$ 0.80	$ 0.44
Diluted earnings per common share (in dollars per share)	$ 0.79	$ 0.44