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Note 16 - Segments and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Long-lived Assets by Geographic Areas [Table Text Block]
   
December
31,
 
   
2020
   
2019
 
                 
United States
  $
2,622
    $
2,818
 
Asia Pacific
   
76
     
64
 
Canada
   
54
     
142
 
Europe
   
7
     
22
 
Total
  $
2,759
    $
3,046