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CONTRACT ASSETS AND CONTRACT LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 25, 2021
Dec. 26, 2020
CONTRACT ASSETS AND CONTRACT LIABILITIES (Tables)    
Costs incurred on uncompleted contracts $ 34,712 $ 39,154
Estimated earnings on uncompleted contracts 4,958 4,388
Earned revenues 39,670 43,542
Less: billings to date 36,679 40,710
Net costs and estimated earnings in excess of billings (billings in excess of costs) on uncompleted contracts 2,991 2,832
Contract assets 3,655 4,090
Contract liabilities (664) (1,258)
Net contract assets $ 2,991 $ 2,832