Business Segments and Customers (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Revenue information shown by geographic region
Total revenues	$ 38,273	$ 33,859	$ 33,159
United States
Revenue information shown by geographic region
Total revenues	21,043	18,496	18,447
Europe
Revenue information shown by geographic region
Total revenues	7,345	7,468	8,940
Rest of Americas
Revenue information shown by geographic region
Total revenues	3,309	2,335	2,287
Asia/Pacific Rim
Revenue information shown by geographic region
Total revenues	$ 6,576	$ 5,560	$ 3,485