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Prepayments and Other Receivables (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Prepayments and Other Receivables [Abstract]    
Value added tax recoverable $ 3,698,596 $ 5,359,275
Prepayments to suppliers 785,669 1,157,966
Deposits 94,927 56,974
Staff advances 41,789 54,207
Prepaid operating expenses 497,004 309,415
Others 146,852 212,617
Prepayments and other receivables, gross 5,264,837 7,150,454
Less: Allowance for doubtful accounts (7,000) (7,000)
Prepayments and other receivables, net $ 5,257,837 $ 7,143,454