XML 67 R57.htm IDEA: XBRL DOCUMENT
v3.21.1

Construction Backlog (Details Textual) | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) Item | Dec. 31, 2020 USD ($) Item | Dec. 31, 2019 USD ($)
Construction Backlog (Textual) |  |  |
Total Backlog | $ 22,871,480 |  |
Construction backlog contract amount |  |  | $ 2,400,000
Contract backlog, description | two contracts entered into during the third quarter of 2020 in the amount of approximately $4 million and approximately $2.95 million |  |
Exclusive License Agreement [Member] |  |  |
Construction Backlog (Textual) |  |  |
Number of large contracts | Item | 1 | 3 |
Contract Two [Member] | Exclusive License Agreement [Member] |  |  |
Construction Backlog (Textual) |  |  |
Construction backlog contract amount |  | $ 800,000 |
Contract One [Member] | Exclusive License Agreement [Member] |  |  |
Construction Backlog (Textual) |  |  |
Construction backlog contract amount |  | 2,700,000 |
Contract Three [Member] | Exclusive License Agreement [Member] |  |  |
Construction Backlog (Textual) |  |  |
Construction backlog contract amount |  | $ 700,000 |

X
- Definition Its represented contract revenue earned during the period. + References No definition available. + Details
Name: | sgbx_ConstructionBacklogContractRevenue
Namespace Prefix: | sgbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | sgbx_ConstructionBacklogTextualAbstract
Namespace Prefix: | sgbx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | sgbx_ContractBacklogDescription
Namespace Prefix: | sgbx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Its represented number of large contracts. + References No definition available. + Details
Name: | sgbx_NumberOfLargeContracts
Namespace Prefix: | sgbx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=sgbx_ExclusiveLicenseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=sgbx_ContractTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=sgbx_ContractOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=sgbx_ContractThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |