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Note 17 - Segment and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

 

United States

 $53,520  $33,987 

International

  52,102   44,027 

Total revenue

 $105,622  $78,014 
Revenue from External Customers by Products and Services [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

 

Lease revenue

 $45,094  $33,428 

System revenue

  43,106   28,957 

Product revenue

  13,230   10,858 

Service revenue

  4,192   4,771 

Total revenue

 $105,622  $78,014