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Loans Held for Investment - Loan Structure (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Loans and Financing Receivable    
Principal Balance $ 482,089,565 $ 424,174,758
Carrying value $ 480,462,652 $ 422,280,515
% of Total 100.00% 100.00%
Allowance for Loan and Lease Losses, Real Estate $ (4,319,563) $ (3,738,758)
Percent Of Allowance Of Loan Losses (0.90%) (0.90%)
First Mortgage    
Loans and Financing Receivable    
Principal Balance $ 383,044,928 $ 254,042,847
Carrying value $ 385,439,932 $ 255,093,989
% of Total 80.20% 60.50%
Equity Securities, Investment Summary    
Loans and Financing Receivable    
Principal Balance $ 89,044,637 $ 141,590,632
Carrying value $ 89,182,058 $ 142,002,144
% of Total 18.60% 33.60%
Mezzanine Loans    
Loans and Financing Receivable    
Principal Balance $ 10,000,000 $ 28,541,279
Carrying value $ 10,160,225 $ 28,923,140
% of Total 2.10% 6.80%