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1. General (Tables)
6 Months Ended
Jun. 28, 2019
Table Text Block Supplement [Abstract]  
Schedule of Inventory

Inventories consisted of the following:

  June 28,   December 31,
  2019   2018
           
Raw materials  $ 5,503    $ 5,979 
Work in process   72      116 
Finished goods   326      323 
Reserve for obsolete inventory   (3,346)     (3,346)
Inventories, net  $ 2,555    $ 3,072