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Prepayments and Other Receivables (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Prepayments and Other Receivables [Abstract]    
Value added tax recoverable $ 3,520,903 $ 4,124,624
Prepayments to suppliers 301,964 60,090
Deposits 24,043 63,184
Staff advances 44,839 53,731
Prepaid operating expenses 381,525 317,151
Others 159,075 124,133
Prepayments and other receivables, gross 4,432,349 4,742,913
Less: Allowance for doubtful accounts (7,000) (7,000)
Prepayments and other receivables, net $ 4,425,349 $ 4,735,913