SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, List of Investments (Details)	Jun. 30, 2021 USD ($)
Fair Value Option [Abstract]
Fair Value	$ 40,590,394
FSP Satellite Place [Member] | Corporation [Member] | Non Traded Company [Member]
Fair Value Option [Abstract]
Ownership percentage	35.60%
Fair Value	$ 2,867,911
5210 Fountaingate, LP [Member] | Limited Partnership [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	9.92%
Fair Value	$ 30,574
Bishop Berkeley, LLC [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	69.03%
Fair Value	$ 5,142,164
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	$ 6,448,000
Britannia Preferred Members, LLC - Class 2 [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	40.28%
Fair Value	$ 5,891,945
Capitol Hill Partners, LLC [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	25.93%
Fair Value	$ 1,007,000
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	$ 11,449,296
Lakemont Partners, LLC [Member] | Limited Liability Company [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	17.02%
Fair Value	$ 817,770
Secured Income L.P. [Member] | Limited Partnership [Member] | LP Interest [Member]
Fair Value Option [Abstract]
Ownership percentage	6.57%
Fair Value	$ 267,734