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Prepayments and Other Receivables (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Prepayments and Other Receivables [Abstract]    
Value added tax recoverable $ 3,319,168 $ 4,124,624
Prepayments to suppliers 319,056 60,090
Deposits 42,907 63,184
Staff advances 69,407 53,731
Prepaid operating expenses 484,230 317,151
Others 127,032 124,133
Prepayments and other receivables, gross 4,361,800 4,742,913
Less: Allowance for doubtful accounts (7,000) (7,000)
Prepayments and other receivables, net $ 4,354,800 $ 4,735,913