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Supplemental Financial Information (Schedule Of Property, Plant And Equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Property and Equipment    
Property and equipment, gross $ 11,106 $ 13,981
Accumulated depreciation (10,820) (13,702)
Property and equipment, net 286 279
Machinery and Equipment    
Property and Equipment    
Property and equipment, gross 7,867 8,850
Leasehold Improvements    
Property and Equipment    
Property and equipment, gross 737 833
Furniture and Fixtures    
Property and Equipment    
Property and equipment, gross 55 420
Computer equipment and software    
Property and Equipment    
Property and equipment, gross $ 2,447 $ 3,878
Minimum    
Property and Equipment    
Estimated Useful Life 3 years  
Maximum    
Property and Equipment    
Estimated Useful Life 7 years