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Prepaid Land Use Rights, Net (Tables)
6 Months Ended
Jun. 30, 2019
Prepaid Land Use Rights, net [Abstract]  
Schedule of prepaid land use rights
   December 31,   June 30, 
   2018   2019 
Prepaid land use rights  $8,167,587   $8,182,640 
Accumulated amortization   (721,470)   (804,626)
   $7,446,117   $7,378,014 
Less: Classified as current assets   (163,352)   (163,653)
   $7,282,765   $7,214,361