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Advance to Suppliers, Net (Tables)
 9 Months Ended
Sep. 30, 2013
Advance To Suppliers Net [Abstract]  
Advances to suppliers
Advance to suppliers represent the payments made to suppliers in advance for the purchase of certain materials and fuels. Advances to suppliers consisted of the following:
 
 
 
September 30,
2013
 
December 31,
2012
 
Advances to suppliers
 
$
18,024,223
 
$
16,744,629
 
Allowance for doubtful accounts
 
 
(766,449)
 
 
(357,016)
 
Advances to suppliers, net
 
$
17,257,774
 
$
16,387,613