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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment

   March 31,   December 31, 
   2019   2018 
Permit of land use  $419,703   $409,612 
Building   9,746,159    9,511,832 
Plant, machinery and equipment   27,305,129    26,576,409 
Motor vehicle   320,513    312,807 
Office equipment   203,428    198,292 
Total   37,994,932    37,008,952 
Less: accumulated depreciation   (18,927,900)   (17,714,573)
Property, Plant and Equipment, net  $19,067,032   $19,294,379 
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