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Prepayments and Other Receivables (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Prepayments and Other Receivables [Abstract]    
Value added tax recoverable $ 5,359,275 $ 5,963,506
Prepayments to suppliers 1,157,966 706,488
Deposits 56,974 25,922
Staff advances 54,207 59,942
Prepaid operating expenses 309,415 185,690
Others 212,617 37,262
Prepayments and other receivables, gross 7,150,454 6,978,810
Less: Allowance for doubtful accounts (7,000) (7,000)
Prepayments and other receivables, net $ 7,143,454 $ 6,971,810