Note 9 - Earnings Per Share - Calculation of Diluted Weighted-average Shares Outstanding (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net income from continuing operations	$ 278,057	$ 387,143
Net loss from discontinued operations		(345,935)
Less: Earnings (loss) allocated to participating securities	(3,654)	(643)
Net income allocated to common shareholders	$ 274,403	$ 40,565
Weighted-average common shares outstanding including participating securities (in shares)	3,208,618	3,360,612
Less: Average participating securities (in shares)	(40,012)	(49,798)
Less: Average unallocated ESOP Shares (in shares)	(164,096)	(170,316)
Average shares (in shares)	3,004,510	3,140,498
Earnings per common share - continuing operations (in dollars per share)	$ 0.09	$ 0.12
Loss per common share - discontinued operations (in dollars per share)		(0.11)
Earnings per common share - Basic (in dollars per share)	$ 0.09	$ 0.01
Net income allocated to common shareholders	$ 497,432	$ 40,565
Add: Dilutive effects of assumed exercises of stock options (in shares)		4,712
Weighted average shares and dilutive potential common shares (in shares)	3,004,510	3,145,210
Diluted earnings per common share - continuing operations (in dollars per share)	$ 0.09	$ 0.12
Diluted loss per common share - discontinued operations (in dollars per share)		(0.11)
Earnings per common share - Diluted (in dollars per share)	$ 0.09	$ 0.01