Note 7 - Intangible Assets - Goodwill and Other Intangibles (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Goodwill	$ 1,434,982	$ 1,434,982
Gross carrying amount	3,520,000	3,520,000
Accumulated amortization	(1,135,000)	(1,016,000)
Core deposit intangible, net	2,384,660	2,503,910
Remaining balance	$ 3,820,000	$ 3,939,000