Note 5 - Loans and Allowance for Loan Losses - Nonaccruing Loans (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Nonaccruing loans	$ 12,340,576	$ 13,081,679
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Nonaccruing loans	6,597,376	4,136,342
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Nonaccruing loans
Real Estate, Construction [Member]
Nonaccruing loans	2,381,737	4,088,409
Commercial Real Estate Portfolio Segment [Member]
Nonaccruing loans	2,559,091	3,592,476
Commercial Portfolio Segment [Member]
Nonaccruing loans	585,823	1,262,910
Consumer and Other Loans [Member]
Nonaccruing loans	$ 216,549	$ 1,542