The estimated maximum amount of possible loss from the contingency.

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The estimated minimum amount of possible loss from the contingency.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Commitments and Contingencies (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Dec. 28, 2014
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Total rent expense, net of sublease income	$ 238,000	$ 240,000	$ 477,000	$ 471,000
Wafer purchase commitment
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Outstanding commitment for purchases	913,000		913,000		$ 552,000
Other goods and services
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase obligation	1,900,000		1,900,000
Purchase obligations due in twelve months	1,600,000		1,600,000
Royalty claims
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Loss contingency, range of possible loss, minimum	0		0
Loss contingency, range of possible loss, maximum	$ 250,000		$ 250,000