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Prepayments and Other Receivables (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Prepayments and Other Receivables [Abstract]    
Value added tax recoverable $ 3,930,095 $ 4,124,624
Prepayments to suppliers 150,244 60,090
Deposits 34,745 63,184
Staff advances 45,413 53,731
Prepaid operating expenses 327,749 317,151
Others 157,921 124,133
Prepayments and other receivables, gross 4,646,167 4,742,913
Less: Allowance for doubtful accounts (7,000) (7,000)
Prepayments and other receivables, net $ 4,639,167 $ 4,735,913