Segment Information (Schedule Of Segment Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012 segment	Dec. 31, 2011	Jan. 01, 2011
Segment Reporting Information [Line Items]
Number of reportable business segments									2
Revenues from External Customers	$ 46,359	$ 43,396	$ 48,807	$ 41,946	$ 43,278	$ 43,809	$ 47,768	$ 39,782	$ 180,508	$ 174,637	$ 158,312
Depreciation and Amortization									5,717	6,019	6,615
Operating Income (Loss)									13,274	12,046	9,070
Segment Assets	161,339				155,415				161,339	155,415	146,720
Goodwill	15,279				15,279				15,279	15,279	15,279
Expenditure for Long-Lived Assets									5,974	4,195	4,819
Cross Accessory Division [Member]
Segment Reporting Information [Line Items]
Revenues from External Customers									97,222	102,131	97,776
Depreciation and Amortization									4,118	4,564	4,780
Operating Income (Loss)									(171)	1,205	817
Segment Assets	101,909				104,761				101,909	104,761	98,566
Expenditure for Long-Lived Assets									3,722	2,510	3,734
Cross Optical Group [Member]
Segment Reporting Information [Line Items]
Revenues from External Customers									83,286	72,506	60,536
Depreciation and Amortization									1,599	1,455	1,835
Operating Income (Loss)									13,445	10,841	8,253
Segment Assets	59,430				50,654				59,430	50,654	48,154
Goodwill	15,279				15,279				15,279	15,279	15,279
Expenditure for Long-Lived Assets									$ 2,252	$ 1,685	$ 1,085