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Contract Assets and Contract Liabilities (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 4,572,581 | $ 513,558
Estimated earnings to date on uncompleted contracts | 872,302 | 127,032
Gross contract assets | 5,444,883 | 640,590
Less: billings to date | (5,916,487) | (703,532)
Net contract assets (liabilities) | $ (471,604) | $ (62,942)

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- Definition Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contracts. + References No definition available. + Details
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Namespace Prefix: | sgbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with customer asset liability + References No definition available. + Details
Name: | sgbx_ContractWithCustomerAssetLiability
Namespace Prefix: | sgbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Costs in excess of billings to date. + References No definition available. + Details
Name: | sgbx_CostsInExcessOfBillingsToDate
Namespace Prefix: | sgbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Costs incurred on uncompleted contracts. + References No definition available. + Details
Name: | sgbx_CostsIncurredOnUncompletedContracts
Namespace Prefix: | sgbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated income loss on uncompleted contracts. + References No definition available. + Details
Name: | sgbx_EstimatedIncomeLossOnUncompletedContracts
Namespace Prefix: | sgbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesLongTermContractsOrProgramsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration