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INTEREST RATE SWAP DERIVATIVES - Narrative (Q2) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
instrument
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
instrument
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
instrument
Dec. 31, 2019
USD ($)
instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Number of swap agreements terminated         3  
(Gain) loss on interest rate swaps | $ $ 90,600 $ (7,785) $ 517,719 $ (1,292,752) $ (770,898) $ (820,496)
Interest Rate Swaps            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Number of mortgage notes payable 4   4     4
Number of swap agreements terminated     4