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Accounts Receivable
3 Months Ended
Mar. 31, 2014
Accounts Receivable [Abstract]  
Accounts Receivable
4.           Accounts Receivable
 
At March 31, 2014 and December 31, 2013, the Company’s accounts receivable consisted of the following:
 
  
2014
  
2013
 
Billed:
      
SG Block sales
 $241,423  $258,287 
Engineering services
  11,774   12,344 
Project management
  81,140   71,594 
Total gross receivables
  334,337   342,225 
Less: allowance for doubtful accounts
  (95,706)  (95,706)
Total net receivables
 $238,631  $246,519