Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Carrying balance of TDR	$ 11,130,490	$ 11,309,930
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Carrying balance of TDR	1,195,262	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	4,004,409	4,088,409
Commercial Real Estate Portfolio Segment [Member]
Carrying balance of TDR	5,458,192	5,508,444
Commercial Portfolio Segment [Member]
Carrying balance of TDR	472,627	504,481
Consumer and Other Loans [Member]
Carrying balance of TDR