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REAL ESTATE INVESTMENTS, NET - Real Estate Impairment Charges (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Real Estate [Line Items]            
Impairment of real estate investment properties $ 0 $ 0 $ 349,457 $ 9,157,068 $ 0 $ 9,506,525
Rite Aid | Industrial            
Real Estate [Line Items]            
Impairment of real estate investment properties           349,457
Dana | Industrial            
Real Estate [Line Items]            
Impairment of real estate investment properties           2,184,395
24 Hour Fitness | Retail            
Real Estate [Line Items]            
Impairment of real estate investment properties           5,664,517
Dinan Cars | Industrial            
Real Estate [Line Items]            
Impairment of real estate investment properties           $ 1,308,156