Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2018
Carrying balance of TDR	$ 7,044,565	$ 5,636,365
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Carrying balance of TDR	1,001,925	1,163,782
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Carrying balance of TDR
Real Estate, Construction [Member]
Carrying balance of TDR	4,423,691	3,738,409
Commercial Real Estate Portfolio Segment [Member]
Carrying balance of TDR	764,874	161,491
Commercial Portfolio Segment [Member]
Carrying balance of TDR	854,075	572,683
Consumer and Other Loans [Member]
Carrying balance of TDR