Business Segments (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 28, 2013 country Customer Segment	Sep. 29, 2012 Customer country	Sep. 28, 2013 country Customer	Sep. 29, 2012 country Customer
Business segments (Additional Textual) [Abstract]
Number of operating segments	1
Individual country accounted	1	1	1	1
Company's revenues accounted	58.50%	57.30%	53.30%	53.50%
Number of customers accounted for more than ten percent of revenue	0	0	0	0
Maximum
Business Segments (Textual) [Abstract]
Customer accounted, total revenue	10.00%	10.00%	10.00%	10.00%