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Mortgages Receivable - Maturities of mortgage loans (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Mortgages Receivable    
2021 $ 112,313,184  
2022 33,433,297  
2023 9,598,788  
2024 271,031  
Total $ 155,616,300 $ 94,348,689