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Fair Value Measurements - Valuation techniques (Details)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	$ 478,397,706	$ 419,407,194
Long-term Debt, Fair Value	373,532,517	239,327,483
Revolving line of credit
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	42,597,991
Level 3
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	478,397,706	419,407,194
Long-term Debt, Fair Value	288,339,417	239,327,483
Level 3 | Revolving line of credit
Fair Value Measurement Inputs and Valuation Techniques
Long-term Debt, Fair Value	25,299,713	0
Level 3 | Loans held for investment, net
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	478,397,706	415,113,225
Level 3 | Loans Held For Investment Acquired Through Participation
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0	4,293,969
Level 3 | Term loans payable
Fair Value Measurement Inputs and Valuation Techniques
Long-term Debt, Fair Value	94,197,966	107,248,555
Level 3 | Obligations Under Participation Agreements
Fair Value Measurement Inputs and Valuation Techniques
Long-term Debt, Fair Value	105,281,167	70,693,207
Level 3 | Mortgage loan payable
Fair Value Measurement Inputs and Valuation Techniques
Long-term Debt, Fair Value	32,391,423	44,348,689
Level 3 | Secured borrowing
Fair Value Measurement Inputs and Valuation Techniques
Long-term Debt, Fair Value	$ 31,169,148	$ 17,037,032
Level 3 | Discounted Cash Flow | Discount Rate | Revolving line of credit | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0400
Level 3 | Discounted Cash Flow | Discount Rate | Revolving line of credit | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0400
Level 3 | Discounted Cash Flow | Discount Rate | Revolving line of credit | Weighted average
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0400
Level 3 | Discounted Cash Flow | Discount Rate | Loans held for investment, net | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0428	0.0529
Level 3 | Discounted Cash Flow | Discount Rate | Loans held for investment, net | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.1500	0.2005
Level 3 | Discounted Cash Flow | Discount Rate | Loans held for investment, net | Weighted average
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0919	0.1038
Level 3 | Discounted Cash Flow | Discount Rate | Loans Held For Investment Acquired Through Participation | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0000	0.1289
Level 3 | Discounted Cash Flow | Discount Rate | Loans Held For Investment Acquired Through Participation | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0000	0.1289
Level 3 | Discounted Cash Flow | Discount Rate | Loans Held For Investment Acquired Through Participation | Weighted average
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0000	0.1289
Level 3 | Discounted Cash Flow | Discount Rate | Term loans payable | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0400	0.0525
Level 3 | Discounted Cash Flow | Discount Rate | Term loans payable | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0400	0.0525
Level 3 | Discounted Cash Flow | Discount Rate | Term loans payable | Weighted average
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0400	0.0525
Level 3 | Discounted Cash Flow | Discount Rate | Obligations Under Participation Agreements | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0713	0.0975
Level 3 | Discounted Cash Flow | Discount Rate | Obligations Under Participation Agreements | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.1500	0.2005
Level 3 | Discounted Cash Flow | Discount Rate | Obligations Under Participation Agreements | Weighted average
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.1165	0.1258
Level 3 | Discounted Cash Flow | Discount Rate | Mortgage loan payable | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0608	0.0608
Level 3 | Discounted Cash Flow | Discount Rate | Mortgage loan payable | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0608	0.0608
Level 3 | Discounted Cash Flow | Discount Rate | Mortgage loan payable | Weighted average
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0608	0.0608
Level 3 | Discounted Cash Flow | Discount Rate | Secured borrowing | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0712	0.1125
Level 3 | Discounted Cash Flow | Discount Rate | Secured borrowing | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0712	0.1125
Level 3 | Discounted Cash Flow | Discount Rate | Secured borrowing | Weighted average
Fair Value Measurement Inputs and Valuation Techniques
Measurement Input	0.0712	0.1125

X

- Definition

Value of input used to measure alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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