SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, List of Investments (Details)	Sep. 30, 2021 USD ($)
Fair Value Option [Abstract]
Fair Value	$ 36,833,300
FSP Satellite Place [Member] | Corporation [Member] | Non-Traded Company [Member]
Fair Value Option [Abstract]
Ownership percentage	39.82%
Fair Value	$ 2,792,141
5210 Fountaingate, LP [Member] | Limited Partnership [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	9.92%
Fair Value	$ 2,000
Bishop Berkeley, LLC [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	69.03%
Fair Value	$ 8,991
BP3 Affiliate, LLC [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	12.51%
Fair Value	$ 1,668,000
Britannia Preferred Members, LLC -Class 1 [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	26.99%
Fair Value	$ 6,656,000
Britannia Preferred Members, LLC - Class 2 [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	40.28%
Fair Value	$ 5,519,430
Capitol Hill Partners, LLC [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	23.33%
Fair Value	$ 1,073,500
Citrus Park Hotel Holdings, LLC [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	35.27%
Fair Value	$ 5,000,000
Dimensions 28, LLP [Member] | Limited Partnership [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	90.00%
Fair Value	$ 12,992,292
Lakemont Partners, LLC [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	17.10%
Fair Value	$ 814,410
Secured Income L.P. [Member] | Limited Partnership [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	6.57%
Fair Value	$ 306,536