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Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Dec. 31, 2011
Net revenue from unaffiliated customers:          
Net revenue from unaffiliated customers $ 78,763 $ 91,177 $ 274,138 $ 252,045  
Gross profit:          
Gross profit 9,374 10,263 35,111 26,522  
Operating income (loss):          
Operating income (loss) 635 1,554 9,606 5,667  
Total assets:          
Total assets 171,885   171,885   175,725
Industrial Group [Member]
          
Net revenue from unaffiliated customers:          
Net revenue from unaffiliated customers 65,176 72,647 230,548 201,082  
Gross profit:          
Gross profit 6,574 6,931 25,402 19,143  
Operating income (loss):          
Operating income (loss) 3,801 4,167 17,254 14,816  
Total assets:          
Total assets 126,184   126,184   128,386
Electronics Group [Member]
          
Net revenue from unaffiliated customers:          
Net revenue from unaffiliated customers 13,587 18,530 43,590 50,963  
Gross profit:          
Gross profit 2,800 3,332 9,709 7,379  
Operating income (loss):          
Operating income (loss) (947) (342) (487) (2,655)  
Total assets:          
Total assets 37,967   37,967   32,277
General, corporate and other [Member]
          
Operating income (loss):          
Operating income (loss) (2,219) (2,271) (7,161) (6,494)  
Total assets:          
Total assets $ 7,734   $ 7,734   $ 15,062