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Prepayment and other current assets (Tables)
6 Months Ended
Jun. 30, 2012
Prepayment and Other Current Assets

Prepayment and other current assets consisted of the following as of June 30, 2012 and December 31, 2011:

 

    June 30,
2012
    December 31,
2011
 
Prepaid AMEX annual fee   $ 20,625     $ 18,125  
Recoverable VAT     4,166,984       4,776,962  
Prepaid insurance     167,765       61,357  
Prepayment for purchase of materials     146,809       206,930  
Others     4,223       7,841  
    $ 4,506,406     $ 5,071,215