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Net Income (Loss) Per Share (Tables)
6 Months Ended
Jun. 30, 2018
Net Income (Loss) Per Share [Abstract]  
Schedule of shares outstanding to calculate both the basic and diluted loss per share
  For the Three Months Ended June 30,  For the Six Months Ended June 30, 
  2018  2017  2018  2017 
  (Unaudited)  (Unaudited)  (Unaudited)  (Unaudited) 
             
Net (loss) attributable to SG Blocks $(1,232,904) $(1,705,672) $(1,987,005) $(2,396,002)
                 
Net loss per share - basic and diluted:                
Basic and diluted $(.29) $(3.15) $(.47) $(6.75)
                 
Weighted average shares outstanding:                
Basic and diluted  4,260,041   541,424   4,260,041   354,703