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Property, plant and equipment (Tables)
12 Months Ended
Dec. 31, 2016
Property, plant and equipment [Abstract]  
Schedule of property, plant and equipment
  December 31,  December 31, 
  2016  2015 
Property, Plant, and Equipment:      
Land use rights $11,755,168  $7,305,641 
Building and improvements  92,927,111   99,299,487 
Machinery and equipment  123,932,336   132,785,421 
Vehicles  590,619   665,789 
Construction in progress  25,084,416   21,697,207 
Totals  254,289,650   261,753,545 
Less: accumulated depreciation and amortization  (66,599,770)  (55,562,387)
Property, Plant and Equipment, net $187,689,880  $206,191,158