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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Costs and estimated earnings on uncompleted contracts
Costs incurred on uncompleted contracts		$ 228,643sgbx_CostsIncurredOnUncompletedContracts
Provision for loss on uncompleted contracts		9,896us-gaap_ProvisionForLossOnContracts
Estimated earnings (losses)		(47,932)sgbx_EstimatedEarningsOnUncompletedContracts
Cost on uncompleted contracts, net		190,607us-gaap_ContractReceivableRetainage
Less: billings to date	(3,500)us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms	(214,956)us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms
Cost in excess of billing on uncompleted contracts, net	$ (3,500)us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms	$ (24,349)us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms

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Costs incurred on uncompleted contracts.

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Estimated earnings on uncompleted contracts.

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Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

+ References

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Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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