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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