Note 3 - Loans Held for Investment, Net - Nonaccrual Loans (Details) - USD ($) |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Total nonaccrual loans | $ 5,694,627 | $ 5,436,972 |
| Other real estate (ORE) | 0 | 0 |
| Total nonperforming assets | $ 5,694,627 | $ 5,436,972 |
| Nonperforming assets to gross loans held for investment and ORE | 2.17% | 2.08% |
| Nonperforming assets to total assets | 1.67% | 1.62% |
| Commercial Real Estate Portfolio Segment [Member] | ||
| Total nonaccrual loans | $ 3,709,122 | $ 3,483,078 |
| One-to-four Family Residential Real Estate Portfolio Segment [Member] | ||
| Total nonaccrual loans | 710,795 | 679,184 |
| Commercial and Industrial Portfolio Segment [Member] | ||
| Total nonaccrual loans | 1,274,710 | 1,274,710 |
| Consumer and Other Portfolio Segment [Member] | ||
| Total nonaccrual loans | $ 0 | $ 0 |