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Note 6 - Segment Information (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
   
Three months ended March 31,
   
2021
 
2020
Revenue:
           
United States
  $
2,260
  $
2,151
Canada
   
580
   
624
Other countries
   
17
   
17
Total revenue
  $
2,857
  $
2,792