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Prepayments and Other Receivables (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Prepayments and Other Receivables [Abstract]    
Value added tax recoverable $ 5,290,600 $ 5,359,275
Prepayments to suppliers 285,327 1,157,966
Deposits 47,383 56,974
Staff advances 59,836 54,207
Prepaid operating expenses 522,117 309,415
Others 77,765 212,617
Prepayments and other receivables, gross 6,283,028 7,150,454
Less: Allowance for doubtful accounts (7,000) (7,000)
Prepayments and other receivables, net $ 6,276,028 $ 7,143,454