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INVENTORIES (Details) - USD ($)
$ in Thousands
Jul. 03, 2021
Dec. 31, 2020
Inventory at FIFO    
Finished products $ 4,651 $ 2,878
Materials and work in process 79,603 77,609
Gross inventories 84,254 80,487
Less: LIFO reserve (48,969) (48,016)
Less: excess and obsolescence reserve (3,298) (3,394)
Net inventories $ 31,987 $ 29,077