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