Note 3 - Securities - Available-for-sale Securities by Maturity (Details)	Sep. 30, 2017 USD ($)
1-5 years, amortized cost	$ 564,554
1-5 years, fair value	581,359
5-10 years, amortized cost	9,254,809
5-10 years, fair value	9,317,277
After ten years, amortized cost	27,192,704
After ten years, fair value	27,064,695
Government sponsored mortgage-backed securities and SBA loan pools not due on a single maturity date, amortized cost	46,936,147
Government sponsored mortgage-backed securities and SBA loan pools not due on a single maturity date, fair value	46,241,864
Amortized cost	83,948,214
Fair value	$ 83,205,195