Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Carrying balance of TDR	$ 10,948,412	$ 11,309,930
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Carrying balance of TDR	1,175,382	1,208,596
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Carrying balance of TDR
Real Estate, Construction [Member]
Carrying balance of TDR	3,815,409	4,088,409
Commercial Real Estate Portfolio Segment [Member]
Carrying balance of TDR	5,358,591	5,508,444
Commercial Portfolio Segment [Member]
Carrying balance of TDR	599,030	504,481
Consumer and Other Loans [Member]
Carrying balance of TDR