INVENTORIES (Details) - USD ($) $ in Thousands	Jan. 03, 2021	Dec. 29, 2019
Inventory Disclosure [Abstract]
Finished goods	$ 28,935	$ 24,447
Raw materials	25,150	22,122
Maintenance parts	5,746	4,575
Inventory, gross	59,831	51,144
Less: inventory reserve	(21)	(250)
Total inventories	$ 59,810	$ 50,894

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Gross amount of components of assembled products that can be sold directly or indirectly through sales of assembled products.

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