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Inventories (Tables)
 6 Months Ended
Jun. 30, 2013
Inventories [Abstract]  
Schedule of inventory
   
June 30,
2013
    
December 31,
2012
  
Raw materials
  
$
13,212,328
    
$
5,687,612
  
Work-in-progress
    
14,125,834
      
7,296,733
  
Finished goods
    
32,836,826
      
36,770,852
  
     
60,174,988
      
49,755,197
  
Less: allowance for obsolete inventories
    
(3,477,690
)
    
(3,716,741
)
  Total inventories
  
$
56,697,298
    
$
46,038,456