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Business Segments (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 29, 2013 Customer country Segment	Jun. 30, 2012 country Customer	Jun. 29, 2013 Customer country	Jun. 30, 2012 country Customer
Business segments (Additional Textual) [Abstract]
Number of operating segments	1
Number of customers accounted for more than ten percent of revenue	0	0	0	0
Individual country accounted	1	1	1	1
Company's sales accounted	53.90%	52.60%	50.50%	51.70%
Percentage of company sales to which no individual country accounted	10.00%	10.00%	10.00%	10.00%
Maximum
Business Segments (Textual) [Abstract]
Customer accounted, total revenue	10.00%	10.00%	10.00%	10.00%

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- Definition

Individual country accounted.

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Number of customers accounted for more than ten percent of revenue.

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Percentage of company sales to which no individual country accounted.

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Share as a percentage to total sales.

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Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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