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Debt - Narratives - Obligations Under Participation Agreements and Secured Borrowing (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument    
Participation mortgage loan $ 91,633,624 $ 105,245,801
Carrying Value 480,462,652 422,280,515
Unarmortized Finance Cost 5,710,484 2,200,000
Participating Mortgage Loan    
Debt Instrument    
Participation mortgage loan 106,190,225 71,581,897
Carrying Value $ 164,170,603 $ 168,649,216
Participating Mortgage Loan | Weighted average    
Debt Instrument    
Participating Mortgage Loans, Mortgage Interest Rate 11.30% 10.20%
Secured borrowing    
Debt Instrument    
Participation mortgage loan $ 31,525,439 $ 18,187,663
Carrying Value $ 45,813,408 $ 26,407,494