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DEBT - Mortgage Notes Payable Related to Real Estate Investments Held For Sale, Net (Q2) (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Mortgage notes payable $ 185,758,762 $ 182,948,438  
Plus unamortized mortgage premium 390,426 447,471  
Less: deferred financing costs (1,683,279) (1,491,715)  
Net principal 184,465,909 181,904,194  
Dana      
Debt Instrument [Line Items]      
Mortgage notes payable 0 4,466,865  
Harley Davidson property      
Debt Instrument [Line Items]      
Mortgage notes payable 6,558,170 0  
Mortgages      
Debt Instrument [Line Items]      
Mortgage notes payable 182,758,762 176,948,438 $ 195,739,481
Plus unamortized mortgage premium 390,426 447,471 489,664
Less: deferred financing costs (1,572,582) (1,469,991) (2,189,938)
Net principal 181,576,606 175,925,918 194,039,207
Mortgages | Dana      
Debt Instrument [Line Items]      
Mortgage notes payable   4,466,865 4,551,250
Mortgages | Harley Davidson property      
Debt Instrument [Line Items]      
Mortgage notes payable   0 6,748,029
Mortgages | EcoThrift      
Debt Instrument [Line Items]      
Mortgage notes payable   0 $ 2,639,237
Mortgages | Secured Notes Payable, Real Estate Held-for-sale      
Debt Instrument [Line Items]      
Mortgage notes payable 4,422,616 9,196,855  
Plus unamortized mortgage premium 0 1,550  
Less: deferred financing costs (41,190) (109,967)  
Net principal 4,381,426 9,088,438  
Mortgages | Secured Notes Payable, Real Estate Held-for-sale | Dana | Retail      
Debt Instrument [Line Items]      
Mortgage notes payable 4,422,616 0  
Mortgages | Secured Notes Payable, Real Estate Held-for-sale | Harley Davidson property | Retail      
Debt Instrument [Line Items]      
Mortgage notes payable 0 6,623,346  
Mortgages | Secured Notes Payable, Real Estate Held-for-sale | EcoThrift | Retail      
Debt Instrument [Line Items]      
Mortgage notes payable   2,573,509  
Mortgages | Secured Notes Payable, Real Estate Held-for-sale | EcoThrift | Industrial Property      
Debt Instrument [Line Items]      
Mortgage notes payable $ 0 $ 2,573,509