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Note 6 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
  

Three months ended September 30,

  

Year Ended September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Revenue:

                

United States

 $3,496  $2,354  $8,978  $6,783 

Canada

  1,033   1,134   2,808   2,577 

Other countries

  36   53   94   71 

Total revenue

 $4,565  $3,541  $11,880  $9,431