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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
   March 31,   December 31, 
   2020   2019 
Permit of land use  $397,549   $403,755 
Building   9,231,708    9,375,817 
Plant, machinery and equipment   26,245,097    26,309,262 
Motor vehicle   303,595    308,334 
Office equipment   216,093    217,058 
Total   36,394,042    36,614,226 
Less: accumulated depreciation   (20,625,801)   (20,300,399)
Property and Equipment, net  $15,768,241   $16,313,827 
Schedule of depreciation is computed on straight-line basis over estimated useful lives of assets

Asset   Life - years
Permit of land use  40 - 70
Building  20 - 49
Plant, machinery and equipment  5 - 10
Motor vehicle  5 - 10
Office equipment  3-5