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Supplemental Financial Information (Schedule Of Warranty Liability Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Supplemental Financial Information    
Beginning balance $ 89 $ 122
Estimated cost of warranty claims charged to cost of sales 49 11
Cost of actual warranty claims (38) (88)
Ending balance 100 45
Less current portion (60) (23)
Long-term warranty liability $ 40 $ 22