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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2013	Dec. 28, 2012
Public Utilities, Inventory [Line Items]
Raw materials and purchased parts	$ 1,647	$ 1,946
Work-in-process	2,999	1,318
Finished goods	7,968	8,945
Inventory, Gross	12,614	12,209
Less: inventory reserves	734	536
Inventory, Net	$ 11,880	$ 11,673

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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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