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Accounts Receivable
 9 Months Ended
Sep. 30, 2011
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
4.
Accounts Receivable

At December 31, 2010 and 2009 and September 30, 2011, the Company’s accounts receivable consisted of the following:

   
2010
   
2009
   
2011
 
SG block sales
  $ 120,318     $ 193,248     $ 138,575  
Engineering services
    33,317       17,512       33,317  
Project management
    69,962       80,481       59,892  
 Total gross receivables
    223,597       291,241       231,784  
Less: allowance for doubtful accounts
    (34,362 )     (6,000 )     (50,015 )
 Total net receivables
  $ 189,235     $ 285,241     $ 181,769