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Schedule IV - Reconciliation of Mortgage Loans on Real Estate (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]    
Balance at beginning of year $ 547,345,334 $ 635,260,420
Mortgage loans purchased 983,694,326 57,601,572
Mortgage loan repayments (528,802,705) (145,516,658)
Accretion of purchase discount 46,088 0
Amortization of purchase premium (457,749) 0
Balance at end of year $ 1,001,825,294 $ 547,345,334