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Debt - Future minimum repayments (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Debt    
2021 $ 3,958,622  
2022 15,834,489  
2023 20,288,211  
2024 109,947,950  
2025 3,600,000  
Total long-term debt $ 153,629,272 $ 213,883,887