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1. General (Tables)
9 Months Ended
Sep. 27, 2019
Table Text Block Supplement [Abstract]  
Schedule of Inventory

Inventories consisted of the following:

 

  September 27,   December 31,
  2019   2018
           
Raw materials $ 5,387      $ 5,979   
Work in process   115        116   
Finished goods   459        323   
Reserve for obsolete inventory   (3,346)       (3,346)  
Inventories, net $ 2,615      $ 3,072