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Note 5 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
  Three months ended September 30,  Nine months ended September 30, 
  

2023

  

2022

  

2023

  

2022

 

Revenue:

                

United States

 $3,464  $3,746  $10,507  $12,187 

Canada

  1,033   1,021   2,626   3,055 

Other countries

  -   39   40   102 

Total revenue

 $4,497  $4,806  $13,173  $15,344