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Inventory (Details) - USD ($)	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Dec. 28, 2018
Inventory [Line Items]
Raw materials	$ 2,245,000		$ 1,922,000
Work in process	6,514,000		6,170,000
Finished goods	4,862,000		3,836,000
Total	13,621,000		11,928,000
Write-downs on inventory	200,000	$ 0
Current portion included in Inventory
Inventory [Line Items]
Total	10,143,000		9,838,000
Long-term portion included in Other long-term assets
Inventory [Line Items]
Total	$ 3,478,000		$ 2,090,000

X

- Definition

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 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 loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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