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Equity Investment in a Limited Partnership - Summarized financial information of the Companys equity investment - subnote (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments |  |  |
Carrying Value | $ 480,462,652 |  | $ 422,280,515
Proceeds from obligations under participation agreements | 57,103,598 | $ 19,784,155 |
Mavik RESOF |  |  |
Schedule of Equity Method Investments |  |  |
Carrying Value | 74,285,158 |  | 44,174,031
Proceeds from obligations under participation agreements | $ 6,808,000 |  | $ 6,295,100

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