Construction Backlog (Details Textual) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Number
Construction Backlog (Textual)
Construction backlog contract amount \| $	$ 27	$ 15	$ 55
Number of large contracts \| Number			2

Its represented contract revenue earned during the period.

No definition available.

Name:	sgbx_ConstructionBacklogContractRevenue
Namespace Prefix:	sgbx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration