Goodwill and Other Intangible Assets (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011	Dec. 31, 2011
Other intangible assets and goodwill (Textual) [Abstract]
Goodwill - Note L	$ 6,759,000		$ 6,759,000		$ 500,000
The weighted average remaining amortization period for the amortizable intangible assets			P13Y3M18D
In-process research & development	320,000		320,000
Goodwill And Other Intangible Assets (Additional Textual) [Abstract]
Recorded Amortization Expense	900,000	700,000	2,200,000	1,900,000
Estimates remaining amortization expense in 2012	700,000		700,000
Estimates remaining amortization expense in 2013	2,900,000		2,900,000
Estimates remaining amortization expense in 2014	2,800,000		2,800,000
Estimates remaining amortization expense in 2015	2,700,000		2,700,000
Estimates remaining amortization expense in 2016	2,600,000		2,600,000
Estimates remaining amortization expense, thereafter	18,300,000		18,300,000
Components and Sensors segment [Member]
Other intangible assets and goodwill (Textual) [Abstract]
Net intangible assets excluding goodwill	24,800,000		24,800,000
Goodwill - Note L	6,300,000		6,300,000
In-process research & development	320,000		320,000
EMS segment [Member]
Other intangible assets and goodwill (Textual) [Abstract]
Net intangible assets excluding goodwill	5,200,000		5,200,000
Goodwill - Note L	$ 500,000		$ 500,000
Customer lists/relationships [Member]
Other intangible assets and goodwill (Textual) [Abstract]
The weighted average remaining amortization period for the amortizable intangible assets			P13Y7M6D
Other intangibles [Member]
Other intangible assets and goodwill (Textual) [Abstract]
The weighted average remaining amortization period for the amortizable intangible assets			P3Y10M24D