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Note 3 - Cash (Tables)
6 Months Ended
Jul. 01, 2018
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
   
July
1,
   
December 31,
 
   
2018
   
2017
 
Cash
  $
20,285
    $
18,241
 
Restricted Cash
   
464
     
89
 
Total
  $
20,749
    $
18,330