Business Segments (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 28, 2014 Country Segment Customer	Jun. 29, 2013 Customer Segment Country	Jun. 28, 2014 Country Segment Customer	Jun. 29, 2013 Customer Country Segment
Segment Reporting Information [Line Items]
Number of operating segments	1	1	1	1
Number of country accounted for more than ten percent of revenue	0	0	0	0
Number of customers accounted for more than ten percent of revenue	0	0	0	0
Number of customers accounted for more than ten percent of account receivable	0	0	0	0
Maximum | Revenues
Business Segments (Textual) [Abstract]
Customer accounted, percentage	10.00%	10.00%	10.00%	10.00%
Maximum | Accounts Receivable
Business Segments (Textual) [Abstract]
Customer accounted, percentage	10.00%	10.00%	10.00%	10.00%
United States
Segment Reporting Information [Line Items]
Percentage of revenues accounted	56.50%	53.90%	51.10%	50.50%