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Property, plant and equipment, net (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Schedule of property, plant and equipment    
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
Land use rights [Member]    
Schedule of property, plant and equipment    
Totals 7,104,122 7,305,641
Building and improvements [Member]    
Schedule of property, plant and equipment    
Totals 96,534,093 99,299,487
Machinery and equipment [Member]    
Schedule of property, plant and equipment    
Totals 129,125,443 132,785,421
Vehicles [Member]    
Schedule of property, plant and equipment    
Totals 613,544 665,789
Construction in progress [Member]    
Schedule of property, plant and equipment    
Totals $ 26,119,033 $ 21,697,207