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Property, plant and equipment, net (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Schedule of property, plant and equipment    
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
Land use rights [Member]    
Schedule of property, plant and equipment    
Totals 7,154,046 7,305,641
Building and improvements [Member]    
Schedule of property, plant and equipment    
Totals 97,212,475 99,299,487
Machinery and equipment [Member]    
Schedule of property, plant and equipment    
Totals 130,023,641 132,785,421
Vehicles [Member]    
Schedule of property, plant and equipment    
Totals 579,085 665,789
Construction in progress [Member]    
Schedule of property, plant and equipment    
Totals $ 22,444,157 $ 21,697,207