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REAL ESTATE INVESTMENTS, NET - Real Estate Impairment Charges (Q2) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Real Estate [Line Items]                
Impairment of real estate investment properties $ (400,999) $ 761,100 $ 349,457 $ 9,157,068 $ (400,999) $ 9,506,525 $ 10,267,625 $ 0
Dana | Industrial Property                
Real Estate [Line Items]                
Impairment of real estate investment properties     0     2,184,395 2,184,395  
24 Hour Fitness | Retail                
Real Estate [Line Items]                
Impairment of real estate investment properties     0 $ 5,664,517   5,664,517 5,664,517  
Dinan Cars | Industrial Property                
Real Estate [Line Items]                
Impairment of real estate investment properties     0     1,308,156 1,308,156  
Rite Aid | Industrial Property                
Real Estate [Line Items]                
Impairment of real estate investment properties     349,457     $ 349,457    
Rite Aid | Retail                
Real Estate [Line Items]                
Impairment of real estate investment properties     $ 349,457       $ 349,457