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NOTE 3 - CONTRACTS (Details) - Costs in Excess of Billings and Billings in Excess of Costs (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Dec. 27, 2014
Costs in Excess of Billings and Billings in Excess of Costs [Abstract]    
Costs incurred on uncompleted contracts $ 49,834eng_CostsIncurredOnUncompletedContractsOrProgramsCurrent $ 52,103eng_CostsIncurredOnUncompletedContractsOrProgramsCurrent
Estimated earnings (losses) on uncompleted contracts 18,793eng_EstimatedEarningsLossesOnUncompletedContractsOrProgramsCurrent 19,543eng_EstimatedEarningsLossesOnUncompletedContractsOrProgramsCurrent
Earned revenues 68,627us-gaap_ReceivablesLongTermContractsOrPrograms 71,646us-gaap_ReceivablesLongTermContractsOrPrograms
Less: billings to date 73,148us-gaap_BilledContractReceivables 77,932us-gaap_BilledContractReceivables
Net costs and estimated earnings in excess of billings on uncompleted contracts (4,521)us-gaap_UnbilledContractsReceivable (6,286)us-gaap_UnbilledContractsReceivable
Costs and estimated earnings in excess of billings on uncompleted contracts 3,806us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear 3,546us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Billings in excess of costs and estimated earnings on uncompleted contracts $ (8,327)us-gaap_BillingsInExcessOfCostCurrent $ (9,832)us-gaap_BillingsInExcessOfCostCurrent