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Supplemental Financial Information (Schedule Of Supplemental Disclosures Of Cash Flow Information And Non-Cash Financing Activities) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Supplemental Financial Information    
Debt financing of insurance $ 220 $ 224
Acquisition of equipment through capital lease   179
Issuance of shares for cashless warrant exercises   $ 1