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4. Prepayments and Advances (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Prepayments and advances $ 2,734,382 $ 1,258,700 $ 928,682
Vendor Prepayments [Member]      
Prepayments and advances 1,828,531 1,070,788 776,478
Prepaid Services and Fees [Member]      
Prepayments and advances $ 268,655 $ 187,912 $ 152,204