Note 5 - Intangible Assets - Goodwill and Other Intangibles (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Goodwill	$ 1,434,982	$ 1,434,982
Gross carrying amount	3,520,000	3,520,000
Accumulated amortization	(1,612,000)	(1,493,000)
Core deposit intangible, net	1,907,660	2,026,910
Remaining balance	$ 3,343,000	$ 3,462,000