Note 4 - Loans and Allowance for Loan Losses - Nonaccruing Loans (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Nonaccruing loans	$ 9,694,970	$ 8,631,639
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Nonaccruing loans	2,274,040	2,060,180
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Nonaccruing loans
Real Estate, Construction [Member]
Nonaccruing loans	5,309,728	5,446,896
Commercial Real Estate Portfolio Segment [Member]
Nonaccruing loans	376,091	161,491
Commercial Portfolio Segment [Member]
Nonaccruing loans	1,610,950	925,281
Consumer and Other Loans [Member]
Nonaccruing loans	$ 124,161	$ 37,791