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NOTE 2 - NOTES RECEIVABLE (Details) - Schedule of Accounts, Notes, Loans and Financing Receivable (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Dec. 27, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reserve $ (514)us-gaap_AllowanceForNotesAndLoansReceivableCurrent $ (3,902)us-gaap_AllowanceForNotesAndLoansReceivableCurrent
Total notes receivable 5,100us-gaap_NotesReceivableNet 5,129us-gaap_NotesReceivableNet
Less current portion (net of reserve) (5,100)us-gaap_NotesAndLoansReceivableNetCurrent (2,165)us-gaap_NotesAndLoansReceivableNetCurrent
Notes receivable non-current 0us-gaap_NotesAndLoansReceivableNetNoncurrent 2,964us-gaap_NotesAndLoansReceivableNetNoncurrent
Gulf Coast Engineering and In-Plant Operations [Member] | Furmanite Corporation [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable, Gross 3,600us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_FurmaniteCorporationMember
/ invest_InvestmentAxis
= eng_GulfCoastEngineeringAndInPlantOperationsMember
4,704us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_FurmaniteCorporationMember
/ invest_InvestmentAxis
= eng_GulfCoastEngineeringAndInPlantOperationsMember
Aspen [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable, Gross 514us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_AspenMember
514us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_AspenMember
South Louisiana Ethanol, LLC [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable, Gross 0us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_SouthLouisianaEthanolLLCMember
448us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_SouthLouisianaEthanolLLCMember
Steele & Company, LP [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable, Gross $ 1,500us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_SteeleCompanyLPMember
$ 3,365us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= eng_SteeleCompanyLPMember