Segment Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Segment Reporting Information [Line Items]
Net revenues	$ 57,729	$ 55,430	$ 178,027	$ 166,606
Foil Technology Products [Member]
Segment Reporting Information [Line Items]
Net revenues	22,433	26,307	71,308	80,698
Foil Technology Products [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	500	300	1,400	1,100
Force Sensors [Member]
Segment Reporting Information [Line Items]
Net revenues	16,388	16,502	48,876	50,285
Force Sensors [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	500	600	1,700	1,800
Weighing and Control Systems [Member]
Segment Reporting Information [Line Items]
Net revenues	18,908	12,621	57,843	35,623
Weighing and Control Systems [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 400	$ 600	$ 1,000	$ 1,900