Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net sales	$ 12,014	$ 14,137	$ 36,761	$ 45,007
Costs of goods sold	8,480	10,018	25,103	30,983
Gross profit	3,534	4,119	11,658	14,024
Operating expenses:
Selling, general and administrative	6,228	4,925	15,237	15,674
Research, development and engineering	1,276	1,333	3,427	4,121
Operating loss	(3,970)	(2,139)	(7,006)	(5,771)
Interest income	13	10	36	47
Interest expense	(103)	(114)	(323)	(346)
Foreign exchange loss	(33)	(3)	(147)	(56)
Other income	17	1	63	2
Loss before provision for income taxes	(4,076)	(2,245)	(7,377)	(6,124)
Provision for income taxes	998	153	1,083	430
Net loss	$ (5,074)	$ (2,398)	$ (8,460)	$ (6,554)
Loss per share:
Basic	$ (0.53)	$ (0.25)	$ (0.89)	$ (0.69)
Diluted	$ (0.53)	$ (0.25)	$ (0.89)	$ (0.69)
Weighted average number of shares outstanding:
Basic shares	9,544,864	9,515,967	9,536,010	9,506,926
Effect of dilutive options
Diluted shares	9,544,864	9,515,967	9,536,010	9,506,926