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Property, plant and equipment, net (Tables)
6 Months Ended
Jun. 30, 2016
Property, plant and equipment, net [Abstract]  
Schedule of property, plant and equipment
  June 30,  December 31, 
  2016  2015 
Property, Plant, and Equipment:      
Land use rights $7,154,046  $7,305,641 
Building and improvements  97,212,475   99,299,487 
Machinery and equipment  130,023,641   132,785,421 
Vehicles  579,085   665,789 
Construction in progress  22,444,157   21,697,207 
Totals  257,413,404   261,753,545 
Less: accumulated depreciation and amortization  (62,316,265)  (55,562,387)
Property, Plant and Equipment, net $195,097,139  $206,191,158