Business Segments and Major Customers (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Segment Reporting Information [Line Items]
Revenues	$ 18,899	$ 16,889	$ 39,216	$ 34,939
United States [Member]
Segment Reporting Information [Line Items]
Revenues	7,935	7,676	16,650	15,596
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenues	10,118	8,729	21,078	18,442
Other [Member]
Segment Reporting Information [Line Items]
Revenues	$ 846	$ 484	$ 1,488	$ 901