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Prepayments and Other Current Assets
 6 Months Ended
Jun. 30, 2013
Prepayments and Other Current Assets [Abstract]  
Prepayments and other current assets
(5) Prepayment and other current assets
 
Prepayment and other current assets consisted of the following as of June 30, 2013 and December 31, 2012:
 
   
June 30,
 2013
    
December 31,
 2012
  
Prepaid AMEX annual fee
  
$
22,500
    
$
6,875
  
Recoverable VAT
    
3,991,529
      
4,784,074
  
Prepaid insurance
    
184,587
      
55,922
  
Prepayment for purchase of materials
    
16,199
      
77,445
  
Prepaid land lease
    
194,389
      
475,541
  
Others
    
268
      
1,848
  
   
$
4,409,472
    
$
5,401,705