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Prepayments and Other Receivables (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Prepayments and Other Receivables [Abstract]    
Value added tax recoverable $ 4,124,624 $ 5,359,275
Prepayments to suppliers 60,090 1,157,966
Deposits 63,184 56,974
Staff advances 53,731 54,207
Prepaid operating expenses 317,151 309,415
Others 124,133 212,617
Prepayments and other receivables, gross 4,742,913 7,150,454
Less: Allowance for doubtful accounts (7,000) (7,000)
Prepayments and other receivables, net $ 4,735,913 $ 7,143,454