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Prepayments and Other Receivables (Tables)
9 Months Ended
Sep. 30, 2018
SCHEDULE OF PREPAYMENTS AND OTHER RECEIVABLES [Table Text Block]
    December 31,     September 30,  
    2017     2018  
Value added tax recoverable $ 5,963,506   $ 5,343,106  
Prepayments to suppliers   706,488     441,684  
Deposits   25,922     110,602  
Staff advances   59,942     67,854  
Prepaid operating expenses   185,690     303,102  
Prepaid interest expenses   -     113,976  
Others   37,262     47,465  
    6,978,810     6,427,789  
Less: Allowance for doubtful accounts   (7,000 )   (7,000 )
  $ 6,971,810   $ 6,420,789