Note 10 - Earnings Per Share - Calculation of Diluted Weighted-average Shares Outstanding (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income from continuing operations	$ 502,136	$ 512,732	$ 780,193	$ 899,875
Net loss from discontinued operations		(852,510)		(1,198,445)
Less: Earnings (loss) allocated to participating securities	(6,657)	5,212	(10,298)	4,768
Net income allocated to common shareholders	$ 495,479	$ (334,566)	$ 769,895	$ (293,802)
Weighted-average common shares outstanding including participating securities (in shares)	3,203,399	3,355,929	3,206,009	3,358,183
Less: Average participating securities (in shares)	(40,292)	(48,864)	(40,153)	(49,331)
Less: Average unallocated ESOP Shares (in shares)	(164,096)	(170,316)	(164,096)	(170,316)
Average shares (in shares)	2,999,011	3,136,749	3,001,760	3,138,536
Earnings per common share - continuing operations (in dollars per share)	$ 0.17	$ 0.16	$ 0.26	$ 0.29
Loss per common share - discontinued operations (in dollars per share)		(0.27)		(0.38)
Earnings per common share - Basic (in dollars per share)	$ 0.17	$ (0.11)	$ 0.26	$ (0.09)
Net income allocated to common shareholders	$ 495,479	$ (334,566)	$ 769,895	$ (293,802)
Add: Dilutive effects of assumed exercises of stock options (in shares)		4,747	241	3,399
Weighted average shares and dilutive potential common shares (in shares)	2,999,011	3,141,496	3,002,002	3,141,935
Diluted earnings per common share - continuing operations (in dollars per share)	$ 0.17	$ 0.16	$ 0.26	$ 0.29
Diluted loss per common share - discontinued operations (in dollars per share)		(0.27)		(0.38)
Earnings per common share - Diluted (in dollars per share)	$ 0.17	$ (0.11)	$ 0.26	$ (0.09)