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Product Warranty Reserves (Tables)
 9 Months Ended
Sep. 29, 2012
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
The following is a summary of the Company's product warranty activity.
 
Three Months Ended
 
Nine Months Ended
 
September 29,
2012
 
October 1,
2011
 
September 29,
2012
 
October 1,
2011
Warranty reserve at beginning of period
$
1,208

 
$
1,248

 
$
1,219

 
$
1,472

Warranty liabilities accrued
803

 
819

 
2,349

 
2,432

Warranty liabilities settled
(740
)
 
(733
)
 
(2,367
)
 
(2,314
)
Changes for pre-existing warranty liabilities
(50
)
 
(60
)
 
20

 
(316
)
Warranty reserve at end of period
$
1,221

 
$
1,274

 
$
1,221

 
$
1,274