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Advance to Suppliers, Net
 9 Months Ended
Sep. 30, 2013
Advance To Suppliers Net [Abstract]  
Advance to Suppliers, Net
5. Advance to Suppliers, Net
 
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