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Loans Held for Investment - Summary of the Company's loan portfolio - subnote (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) Loans	Dec. 31, 2020 USD ($) Loans
Loans and Financing Receivable
Number Of Loans | Loans	19	20
Principal Balance	$ 482,089,565	$ 424,174,758
Principal amount	373,228,429	241,152,827
Floating rate
Loans and Financing Receivable
Principal Balance	389,281,253	$ 367,838,966
Revolving line of credit
Loans and Financing Receivable
Principal Balance	42,239,289
Principal amount	$ 25,299,713
Revolving line of credit | LIBOR
Loans and Financing Receivable
Debt Instrument, Basis Spread on Variable Rate	3.25%
Revolving line of credit | Floor rate
Loans and Financing Receivable
Debt Instrument, Basis Spread on Variable Rate	4.00%
Term Loan
Loans and Financing Receivable
Fixed rate	5.25%	5.25%
Principal Balance	$ 162,759,074	$ 184,201,670
Principal amount	$ 93,595,027	$ 107,584,451
Term Loan | LIBOR
Loans and Financing Receivable
Debt Instrument, Basis Spread on Variable Rate	4.25%	4.25%
Term Loan | Floor rate | LIBOR
Loans and Financing Receivable
Debt Instrument, Basis Spread on Variable Rate	1.00%	1.00%
Term Loan | Floating rate | LIBOR
Loans and Financing Receivable
Debt Instrument, Basis Spread on Variable Rate	0.08%	0.14%
Number Of Loans | Loans	12	12
Term Loan | Floating rate | Floor rate | LIBOR
Loans and Financing Receivable
Loans basis spread on variable rate	1.00%
Collateral | Revolving line of credit | Floating rate | Minimum
Loans and Financing Receivable
Fixed rate	4.00%

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