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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2013
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
 
   
June 30,
 2013
    
December 31,
 2012
  
Property, Plant, and Equipment:
                
Land use rights
  
$
10,112,115
    
$
9,895,081
  
Building and improvements
    
28,593,699
      
31,625,816
  
Machinery and equipment
    
119,927,716
      
111,857,002
  
Vehicles
    
465,220
      
439,007
  
Construction in progress
    
24,050,200
      
1,315,664
  
     
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