Business Segments and Major Customers (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Segment Reporting Information [Line Items]
Revenues	$ 21,205	$ 19,332	$ 56,144	$ 52,989
United States [Member]
Segment Reporting Information [Line Items]
Revenues	9,007	9,507	24,603	25,531
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenues	11,764	9,106	30,206	25,401
Other [Member]
Segment Reporting Information [Line Items]
Revenues	$ 434	$ 719	$ 1,335	$ 2,057