Note 5 - Loans and Allowance for Loan Losses - Nonaccruing Loans (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Nonaccruing loans	$ 9,780,017	$ 13,081,679
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Nonaccruing loans	2,166,284	4,136,342
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Nonaccruing loans
Real Estate, Construction [Member]
Nonaccruing loans	3,815,409	4,088,409
Commercial Real Estate Portfolio Segment [Member]
Nonaccruing loans	2,956,289	3,592,476
Commercial Portfolio Segment [Member]
Nonaccruing loans	768,846	1,262,910
Consumer and Other Loans [Member]
Nonaccruing loans	$ 73,189	$ 1,542