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DEBT - Unsecured Credit Facility, Net (FY) (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]      
Unsecured credit facility $ 3,000,000 $ 6,000,000 $ 7,740,000
Less unamortized deferred financing costs (110,697) (21,724) (90,139)
Unsecured credit facility, net $ 2,889,303 $ 5,978,276 $ 7,649,861