Note 4 - Loans and Allowance for Loan Losses - Nonaccruing Loans (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Nonaccruing loans	$ 13,081,679	$ 9,961,517
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Nonaccruing loans	4,136,342	4,423,074
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Nonaccruing loans
Real Estate, Construction [Member]
Nonaccruing loans	4,088,409	4,452,409
Commercial Real Estate Portfolio Segment [Member]
Nonaccruing loans	3,592,476	161,491
Commercial Portfolio Segment [Member]
Nonaccruing loans	1,262,910	802,628
Consumer and Other Loans [Member]
Nonaccruing loans	$ 1,542	$ 121,915