Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Carrying balance of TDR	$ 7,211,655	$ 5,636,365
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Carrying balance of TDR	1,161,988	1,163,782
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Carrying balance of TDR	0	0
Real Estate, Construction [Member]
Carrying balance of TDR	4,442,818	3,738,409
Commercial Real Estate Portfolio Segment [Member]
Carrying balance of TDR	896,454	161,491
Commercial Portfolio Segment [Member]
Carrying balance of TDR	$ 710,395	$ 572,683