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Summary of Significant Accounting Policies (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Cash and cash equivalents $ 51,975,601 $ 18,607,952 $ 65,729,695  
Restricted cash 10,201,589 12,145,616 26,017,300  
Cash held in escrow by lender 3,941,142 2,166,755 1,864,351  
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 66,118,332 $ 32,920,323 $ 93,611,346 $ 50,549,700
Open Tax Year Start 2018      
Open tax year end 2020