Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
TDRs, carrying balance	$ 11,732,555	$ 11,742,351
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
TDRs, carrying balance	1,234,651	1,290,462
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
TDRs, carrying balance
Real Estate, Construction [Member]
TDRs, carrying balance	4,298,409	4,452,409
Commercial Real Estate Portfolio Segment [Member]
TDRs, carrying balance	5,637,357	5,666,096
Commercial Portfolio Segment [Member]
TDRs, carrying balance	562,138	214,529
Consumer and Other Loans [Member]
TDRs, carrying balance		$ 118,855