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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2015
Accounts Receivable [Abstract]  
Summary of accounts receivable

 

  2015  2014 
Billed:      
SG Block sales $117,923  $172,837 
Engineering services  15,663   2,000 
Project management  35,841   15,842 
Total gross receivables  169,427   190,679 
Less: allowance for doubtful accounts  (24,746)  (24,746)
Total net receivables $144,681  $165,933