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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
May 31, 2018 | Dec. 31, 2017 | May 31, 2019 | Jan. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Gain (Loss) on Sale of Investments, Total |  |  |  |  | $ 7,565 | $ 389,947 | $ 432,409 | $ 335,214
Unconsolidated Affiliates [Member] | Board of Directors [Member] |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  | $ 614,593 |  | $ 614,593 |
Breezeway Homes Inc. [Member] |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount |  |  |  | $ 0.2665 |  |  |  |
Preferred Stock [Member] | Breezeway Homes Inc. [Member] |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  |  | 31,227 |  |  |  |
Minimum [Member] | Unconsolidated Affiliates [Member] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 7.15% |  | 7.15% |
Maximum [Member] | Unconsolidated Affiliates [Member] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 30.00% |  | 30.00% |
US Treasury Notes Securities [Member] |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Investments, Total |  |  |  |  |  |  | $ 1,935 |
Voting Common Stock of Privately Held Company CB&T Holding Corporation [Member] |  |  |  |  |  |  |  |
Payments to Acquire Long-term Investments | $ 19,058,485 |  |  |  |  |  |  |
Cost Method Investment, Ownership Percentage | 14.99% |  |  |  |  |  |  |
Non-voting Common Units of LLC [Member] |  |  |  |  |  |  |  |
Payments to Acquire Long-term Investments |  | $ 10,000,000 |  |  |  |  |  |
Cost Method Investment, Ownership Percentage |  | 5.00% |  |  |  |  |  |
Non-voting Preferred Units of DFH LLC [Member] |  |  |  |  |  |  |  |
Payments to Acquire Long-term Investments |  |  | $ 12,000,000 |  |  |  |  |
Percent of Preferred Units Convertible to Non-voting Common Units |  |  | 25.00% |  |  |  |  |
Non-voting Preferred Units of DFH LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Mandatory Preferred Return, Percent |  |  | 14.00% |  |  |  |  |
Voting Convertible Preferred Stock of Breezeway Homes, Inc. [Member] |  |  |  |  |  |  |  |
Cost-method Investments, Other than Temporary Impairment |  |  |  |  |  |  | $ 0 |

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