Industry Segments (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Customer	Jun. 25, 2011 Customer	Jun. 30, 2012 Customer	Jun. 25, 2011 Customer
Industry segments (Textual) [Abstract]
Number of customer accounted for more than 10 percentage of Net sales	1	1	1	2
Percentage of consolidated net sales attributable to significant customer	38.00%	30.00%	42.00%	45.00%