Note 2 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income	$ 1,294	$ 1,190	$ 2,140	$ 2,082	$ 2,484	$ 4,222
Preferred stock dividends	91		91		91	91
Net income available to common stockholders	$ 1,203		$ 2,049		$ 2,393	$ 4,131
Average common shares outstanding - basic (in shares)	2,708,712		2,698,712		2,708,712	2,698,712
Add: Dilutive effects of restricted stock awards (in shares)	13,437		16,946		13,953	15,337
Average shares and dilutive potential common shares (in shares)	2,722,149		2,715,658		2,722,665	2,714,049
Basic earnings per common share (in dollars per share)	$ 0.44		$ 0.76		$ 0.88	$ 1.53
Diluted earnings per common share (in dollars per share)	$ 0.44		$ 0.75		$ 0.88	$ 1.52
Restricted stock awards not considered in computing earnings per share because they were antidulitive (in shares)