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Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Dec. 31, 2011
Net revenue from unaffiliated customers:          
Net revenue from unaffiliated customers $ 98,912 $ 85,058 $ 195,375 $ 160,868  
Gross profit:          
Gross profit 13,223 8,111 25,737 16,259  
Operating income (loss):          
Operating income (loss) 4,468 219 8,971 4,113  
Total assets:          
Total assets 198,078   198,078   175,725 [1]
Industrial Group [Member]
          
Net revenue from unaffiliated customers:          
Net revenue from unaffiliated customers 82,850 68,885 165,372 128,435  
Gross profit:          
Gross profit 8,906 7,080 18,828 12,212  
Operating income (loss):          
Operating income (loss) 6,097 4,634 13,453 10,649  
Total assets:          
Total assets 142,197   142,197   128,386
Electronics Group [Member]
          
Net revenue from unaffiliated customers:          
Net revenue from unaffiliated customers 16,062 16,173 30,003 32,433  
Gross profit:          
Gross profit 4,317 1,031 6,909 4,047  
Operating income (loss):          
Operating income (loss) 724 (2,421) 460 (2,313)  
Total assets:          
Total assets 43,779   43,779   32,277
General, corporate and other [Member]
          
Operating income (loss):          
Operating income (loss) (2,353) (1,994) (4,942) (4,223)  
Total assets:          
Total assets $ 12,102   $ 12,102   $ 15,062
[1] The balance sheet at December 31,2011 has been derived from the audited consolidated financial statements at that date but does not include all information and footnotes required by accounting principles generally accepted in the United States for a complete set of financial statements.