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REVENUE RECOGNITION - Percentage of completion (Details) - USD ($)
$ in Thousands
Jun. 25, 2022
Dec. 25, 2021
Jun. 26, 2021
REVENUE RECOGNITION      
Cost and Earnings in Excess of Billings $ 6,413 $ 5,602 $ 4,201
Billings in Excess of Cost and Earnings $ 10,046 $ 10,744 $ 8,239