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Loans Held for Investment - Lending activities - subnote (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Loans and Financing Receivable    
Paid-in-Kind Interest $ 0 $ 224,197
Real Estate Loan    
Loans and Financing Receivable    
Paid-in-Kind Interest   676,646
Loans held for investment, net | Real Estate Loan    
Loans and Financing Receivable    
Paid-in-Kind Interest   676,646
Loans Held For Investment Acquired Through Participation | Real Estate Loan    
Loans and Financing Receivable    
Paid-in-Kind Interest   0
Obligations Under Participation Agreements | Loans held for investment, net | Real Estate Loan    
Loans and Financing Receivable    
Paid-in-Kind Interest   $ 500,000