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RELATED PARTY TRANSACTIONS - Advisor Fees to Santa Clara (FY) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]    
Amount paid for related party transactions $ 0  
Santa Clara | Asset management fees    
Related Party Transaction [Line Items]    
Amount paid for related party transactions $ 191,933 $ 191,907