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Leases (Details Textual) | 3 Months Ended
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Mar. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items] |
CAT lease term | 18 months
Leases, description | The leases have remaining lease terms of two and a half years to five years. The plant lease includes an option to extend the lease for up to five years.
Sublease term | 1 year
Future lease revenue for the remaining period of 2021 | $ 1,440,000
Future lease revenue for the period of 2022 | $ 320,000

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- Definition Term of lessee's sublease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | sgbx_SubleaseTerm
Namespace Prefix: | sgbx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of minimum sublease rentals for sale-leaseback transactions accounted for using the deposit method or as a financing to be received by the seller-lessee in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsRemainderOfFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of minimum sublease rentals for sale-leaseback transactions accounted for using the deposit method or as a financing to be received by the seller-lessee in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121602099&loc=d3e50824-112756 + Details
Name: | us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsWithinTwoYears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the description of a lease related indemnification agreement including the nature of the indemnification, the maximum potential amount of future payments the indemnification agreement could be required to make under the agreement, the current carrying amount of the liability and the nature of any recourse provision that would enable the lessee guarantor) to recover from third parties any of the amounts paid under the agreement and any assets held either as collateral or by third parties that upon occurrence of any triggering event or condition under the indemnification agreement the guarantor can obtain and liquidate to recover all or a portion of the amounts paid under the indemnification agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
Name: | us-gaap_OperatingLeasesIndemnificationAgreementsDescription
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration