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

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Consolidated Revenue:

                

United States

 $5,609  $3,125  $11,002  $9,466 

Brazil

  320   164   460   1,145 

Other

  158   25   338   240 

Total Revenue

 $6,087  $3,314  $11,800  $10,851