Loans Held for Investment - Property Type (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%)
Office
Loans and Financing Receivable
Principal Balance	$ 212,435,064	$ 182,698,225
Carrying value	$ 213,199,243	$ 183,053,751
% of Total	44.40%	43.30%
Infill Land
Loans and Financing Receivable
Principal Balance	$ 79,495,651	$ 10,442,567
Carrying value	$ 79,895,793	$ 10,537,512
% of Total	16.60%	2.50%
Multifamily
Loans and Financing Receivable
Principal Balance	$ 78,724,866	$ 150,873,173
Carrying value	$ 79,265,718	$ 151,768,347
% of Total	16.50%	35.90%
Hotel - full/select service
Loans and Financing Receivable
Principal Balance	$ 56,847,381	$ 49,142,809
Carrying value	$ 57,365,987	$ 49,393,251
% of Total	11.90%	11.70%
Mixed use
Loans and Financing Receivable
Principal Balance	$ 16,586,603	$ 16,767,984
Carrying value	$ 16,586,603	$ 16,767,984
% of Total	3.50%	4.00%
Student Housing
Loans and Financing Receivable
Principal Balance	$ 31,000,000	$ 3,000,000
Carrying value	$ 31,468,871	$ 3,204,375
% of Total	6.50%	0.80%
Industrial
Loans and Financing Receivable
Principal Balance	$ 7,000,000	$ 7,000,000
Carrying value	$ 7,000,000	$ 7,000,000
% of Total	1.50%	1.70%
Hotel - extended stay
Loans and Financing Receivable
Principal Balance	$ 0	$ 4,250,000
Carrying value	$ 0	$ 4,294,053
% of Total	0.00%	1.00%

Percent Of Allowance Of Loan Losses

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- Definition

Percent Of Loan Portfolio Holdings

+ References

No definition available.

+ Details

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- Definition

Amount, after allowance for credit loss, of accounts and financing receivable. Includes, but is not limited to, notes and loan receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- 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.

+ Details

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- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123605502&loc=d3e21338-158488

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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