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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Schedule of depreciation is computed on straight-line basis over estimated useful lives of assets
   June 30,   December 31, 
   2021   2020 
Permit of land use  $436,011   $431,681 
Building   10,124,855    10,024,303 
Plant, machinery and equipment   29,306,831    29,018,708 
Motor vehicle   332,967    329,660 
Office equipment   274,687    259,175 
Total   40,475,351    40,063,527 
Less: accumulated depreciation   (26,129,229)   (24,499,327)
Property, plant and equipment, net  $14,346,122   $15,564,200 

 
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