Business Segments and Major Customers (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Customer A [Member]
Entity-Wide Revenue, Major Customer, Amount	$ 3,331	$ 4,363	$ 11,312	$ 13,009
Entity Wide Accounts Receivable Major Customer, Amount	2,837	3,492	2,837	3,492
Customer B [Member]
Entity-Wide Revenue, Major Customer, Amount	1,526	1,520	4,850	4,282
Entity Wide Accounts Receivable Major Customer, Amount	887	670	887	670
Customer C [Member]
Entity-Wide Revenue, Major Customer, Amount	1,442	2,521	4,499	7,784
Entity Wide Accounts Receivable Major Customer, Amount	1,861	3,111	1,861	3,111
Customer D [Member]
Entity-Wide Revenue, Major Customer, Amount	244	890	1,213	5,313
Entity Wide Accounts Receivable Major Customer, Amount	$ 455	$ 1,030	$ 455	$ 1,030