Note 4 - Loans and Allowance for Loan Losses - Nonaccruing Loans (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Nonaccruing loans	$ 9,430,126	$ 9,961,517
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Nonaccruing loans	4,258,645	4,423,074
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Nonaccruing loans
Real Estate, Construction [Member]
Nonaccruing loans	4,354,409	4,452,409
Commercial Real Estate Portfolio Segment [Member]
Nonaccruing loans	161,491	161,491
Commercial Portfolio Segment [Member]
Nonaccruing loans	655,581	802,628
Consumer and Other Loans [Member]
Nonaccruing loans		$ 121,915