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Property, Plant and Equipment (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Schedule of property, plant and equipment    
Property, Plant, and Equipment, Gross $ 183,148,950 $ 155,132,570
Less accumulated depreciation and amortization (35,850,036) (32,741,114)
Property, Plant and Equipment, net 147,298,914 122,391,456
Land use rights [Member]
    
Schedule of property, plant and equipment    
Property, Plant, and Equipment, Gross 10,112,115 9,895,081
Building and improvements [Member]
    
Schedule of property, plant and equipment    
Property, Plant, and Equipment, Gross 28,593,699 31,625,816
Machinery and equipment [Member]
    
Schedule of property, plant and equipment    
Property, Plant, and Equipment, Gross 119,927,716 111,857,002
Vehicles [Member]
    
Schedule of property, plant and equipment    
Property, Plant, and Equipment, Gross 465,220 439,007
Construction in progress [Member]
    
Schedule of property, plant and equipment    
Property, Plant, and Equipment, Gross $ 24,050,200 $ 1,315,664