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Property, plant and equipment, net (Tables)
9 Months Ended
Sep. 30, 2016
Property, plant and equipment, net [Abstract]  
Schedule of property, plant and equipment
 September 30,  December 31, 
  2016   2015 
Property, Plant, and Equipment:       
Land use rights $7,104,122   $7,305,641 
Building and improvements  96,534,093    99,299,487 
Machinery and equipment  129,125,443    132,785,421 
Vehicles  613,544    665,789 
Construction in progress  26,119,033    21,697,207 
Totals  259,496,235    261,753,545 
Less: accumulated depreciation and amortization  (65,651,481)   (55,562,387)
Property, Plant and Equipment, net $193,844,754   $206,191,158