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Loans Held for Investment - Loan risk rating (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Loans
Mar. 31, 2021
Loans
Dec. 31, 2021
USD ($)
Loans
Loans and Financing Receivable      
Number Of Loans | Loans 25   21
Principal Balance $ 567,520,973   $ 480,151,151
Carrying Value 571,727,777   483,331,795
Allowance for Loan and Lease Losses, Real Estate (13,708,777)   (13,658,481)
Carrying Value $ 558,019,000   $ 469,673,314
% of Total 100.00%   100.00%
1      
Loans and Financing Receivable      
Number Of Loans | Loans 0   0
Principal Balance $ 0   $ 0
Carrying Value $ 0   $ 0
% of Total 0.00%   0.00%
2      
Loans and Financing Receivable      
Number Of Loans | Loans 2   2
Principal Balance $ 25,000,000   $ 25,000,000
Carrying Value $ 25,041,590   $ 25,041,124
% of Total 4.40%   5.20%
3      
Loans and Financing Receivable      
Number Of Loans | Loans 19   15
Principal Balance $ 435,383,446   $ 349,273,811
Carrying Value $ 439,254,137   $ 352,164,409
% of Total 76.80%   72.90%
4      
Loans and Financing Receivable      
Number Of Loans | Loans 1 3 1
Principal Balance $ 60,583,057   $ 60,012,639
Carrying Value $ 60,583,057   $ 60,012,639
% of Total 10.60%   12.40%
5      
Loans and Financing Receivable      
Number Of Loans | Loans 0 1 0
Principal Balance $ 0   $ 0
Carrying Value $ 0   $ 0
% of Total 0.00%   0.00%
Other      
Loans and Financing Receivable      
Number Of Loans | Loans 3   3
Principal Balance $ 46,554,470   $ 45,864,701
Carrying Value 46,848,993   46,113,623
Allowance for Loan and Lease Losses, Real Estate $ (12,800,000)   $ (12,800,000)
% of Total 8.20%   9.50%