Goodwill and Other Intangible Assets (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011	Dec. 31, 2011
Other intangible assets and goodwill (Textual) [Abstract]
Goodwill - Note L	$ 5,855,000		$ 5,855,000		$ 500,000
The weighted average remaining amortization period for the amortizable intangible assets			P13Y2M12D
Goodwill And Other Intangible Assets (Additional Textual) [Abstract]
Recorded Amortization Expense	700,000	700,000	1,500,000	1,300,000
Estimates remaining amortization expense in 2012	1,600,000		1,600,000
Estimates remaining amortization expense in 2013	3,100,000		3,100,000
Estimates remaining amortization expense in 2014	3,000,000		3,000,000
Estimates remaining amortization expense in 2015	2,900,000		2,900,000
Estimates remaining amortization expense in 2016	2,800,000		2,800,000
Estimates remaining amortization expense, thereafter	18,500,000		18,500,000
Components and Sensors segment [Member]
Other intangible assets and goodwill (Textual) [Abstract]
Net intangible assets excluding goodwill	26,500,000		26,500,000
Goodwill - Note L	5,400,000		5,400,000
EMS segment [Member]
Other intangible assets and goodwill (Textual) [Abstract]
Net intangible assets excluding goodwill	5,400,000		5,400,000
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			P13Y8M12D
Other intangibles [Member]
Other intangible assets and goodwill (Textual) [Abstract]
The weighted average remaining amortization period for the amortizable intangible assets			P4Y2M12D