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Summary of significant accounting policies (Schedule of Expected Amortization of Intangible Assets) (Details)
Mar. 31, 2021
USD ($)
Accounting Policies [Abstract]  
2021 (Nine months) $ 608,457
2022 811,276
2023 811,276
2024 811,276
2025 811,276
2026 811,276
Thereafter 4,928,673
Total $ 9,593,510