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NOTE 11 - STOCK COMPENSATION PLANS (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Jun. 30, 2009
Oct. 20, 2013
Apr. 26, 2012
NOTE 11 - STOCK COMPENSATION PLANS (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 652,481us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod      
Fair Value Measurements, Significant Assumptions We estimate the volatility of our stock price by using historical volatility looking back 156 weeks.        
Fair Value Assumptions, Expected Dividend Rate 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate        
Share-based Compensation (in Dollars) $ 374,000us-gaap_ShareBasedCompensation $ 173,000us-gaap_ShareBasedCompensation      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) 600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 32 months        
Employees [Member] | Restricted Stock [Member]          
NOTE 11 - STOCK COMPENSATION PLANS (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights vest in four equal annual installments on the date of grant, so long as the grantee remains employed full-time with the Company as of each vesting date        
Employees [Member] | 2009 Equity Incentive Plan [Member]          
NOTE 11 - STOCK COMPENSATION PLANS (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     one-fourth at December 31 of each year until they are fully vested    
Director [Member] | Restricted Stock [Member]          
NOTE 11 - STOCK COMPENSATION PLANS (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights vest in quarterly installments beginning September 30 of the year of service, so long as the grantee continues to serve as a director of the Company        
Director [Member] | 2009 Equity Incentive Plan [Member]          
NOTE 11 - STOCK COMPENSATION PLANS (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     vest quarterly over a one-year period coinciding with their service term    
Restricted Stock [Member]          
NOTE 11 - STOCK COMPENSATION PLANS (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value (in Dollars) $ 115,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 39,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 2 years 189 days        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
2009 Equity Incentive Plan [Member]          
NOTE 11 - STOCK COMPENSATION PLANS (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     480,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= eng_EquityIncentivePlan2009Member
1,830,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= eng_EquityIncentivePlan2009Member
980,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= eng_EquityIncentivePlan2009Member
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized       850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= eng_EquityIncentivePlan2009Member
500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= eng_EquityIncentivePlan2009Member