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Accounts Receivable
6 Months Ended
Jun. 30, 2013
Accounts Receivable [Abstract]  
Accounts Receivable
4.           Accounts Receivable
 
At June 30, 2013 and December 31, 2012, the Company’s accounts receivable consisted of the following:
 
   
2013
   
2012
 
Billed:
           
SG Block sales
  $ 304,181     $ 207,390  
Engineering services
    150,877       216,535  
Project management
    611,928       34,900  
Total gross receivables
    1,066,986       458,825  
Less: allowance for doubtful accounts
    (174,430 )     (174,430 )
Total net receivables
  $ 892,556     $ 284,395