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Note 15 - Segments and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Long-lived Assets by Geographic Areas [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
                 
United States
  $
2,818
    $
2,851
 
Asia Pacific
   
64
     
24
 
Canada
   
142
     
28
 
Latin America
   
-
     
5
 
Europe
   
22
     
8
 
Total
  $
3,046
    $
2,916