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DEBT - Interest Expenses Reconciliation (FY) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]            
Interest expense $ 2,098,649 $ 2,558,877 $ 3,879,785 $ 6,463,533 $ 11,460,747 $ 7,382,610
Amortization of deferred financing costs         1,025,093 638,200
Loss on interest rate swaps (90,600) 7,785 (517,719) 1,292,752 770,898 820,496
Accrued interest payable 55,180   55,180   45,636 22,282
Secured Debt            
Debt Instrument [Line Items]            
Interest expense 1,992,812 2,129,678 3,826,636 4,300,183 8,470,248 5,698,606
Amortization of deferred financing costs 103,383 139,600 214,426 258,631 937,564 601,658
Loss on interest rate swaps (92,200) 70,985 (420,243) 1,395,697 1,172,781 843,174
Unsecured Debt            
Debt Instrument [Line Items]            
Interest expense 63,333 166,834 142,085 321,458 527,047 190,130
Amortization of deferred financing costs $ 22,139 $ 42,876 $ 43,863 $ 75,336 128,171 36,542
Other loan fees         $ 224,936 $ 12,500