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Summary of significant accounting policies (Schedule of Expected Amortization of Intangible Assets) (Details)
Sep. 30, 2021
USD ($)
Accounting Policies [Abstract]  
2021 (Three months) $ 200,294
2022 801,174
2023 801,174
2024 801,174
2025 801,174
2026 801,174
Thereafter 4,867,300
Total $ 9,073,464