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7. Intangible Assets - Net (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of land use rights
The land use right term  December 31,
2018
   December 31,
2017
 
May, 2013 - Apr, 2063  $523,619   $553,332 
Dec, 2015 - Sep, 2065   196,349    207,491 
Dec, 2015 - Sep, 2065   23,896    25,252 
Intangible assets- total   743,864    786,075 
Less: accumulated amortization   (71,686)   (60,032)
Intangible assets, net  $672,178   $726,043