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Note 16 - Segments and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Long-lived Assets by Geographic Areas [Table Text Block]
  

December 31,

 
  

2021

  

2020

 
         

United States

 $1,553  $2,622 

Asia Pacific

  -   76 

Canada

  1   54 

Europe

  -   7 

Total

 $1,554  $2,759