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Supplemental Financial Information (Schedule Of Warranty Liability Activity) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Supplemental Financial Information    
Beginning balance $ 100 $ 122
Estimated cost of warranty claims charged to cost of sales 14 22
Cost of actual warranty claims (1) (86)
Ending balance 113 58
Less current portion (68) (35)
Long-term warranty liability $ 45 $ 23