Operating Segment and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2013	Oct. 05, 2013	Jul. 13, 2013	Mar. 23, 2013	Dec. 29, 2012	Oct. 06, 2012	Jul. 14, 2012	Mar. 24, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net sales	$ 46,372	$ 38,482	$ 46,985	$ 31,838	$ 40,789	$ 34,206	$ 42,029	$ 30,565	$ 163,677	$ 147,589	$ 134,250
North America [Member]
Segment Reporting Information [Line Items]
Net sales									144,296	127,013	112,907
Europe [Member]
Segment Reporting Information [Line Items]
Net sales									11,805	13,220	12,240
Other Credit Derivatives [Member]
Segment Reporting Information [Line Items]
Net sales									$ 7,576	$ 7,356	$ 9,103