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INVESTMENT IN UNCONSOLIDATED ENTITY - Narrative (Q2) (Details) - Rich Uncles Real Estate Investment Trust - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Ownership percentage         72.70%
Ownership percentage by noncontrolling owners         27.30%
Dividends $ 82,588 $ 169,158 $ 161,967 $ 334,189  
Hagg Lane II, LLC          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage by noncontrolling owners         23.40%
Hagg Lane III, LLC          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage by noncontrolling owners         3.90%