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Note 14 - Segment Reporting (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Three Months Ended March 31,
  
   
20
20
    
201
9
  
Revenue mix by geography:
  
 
 
 
  
 
 
 
United States
   $
13,784
     $
20,400
  
Japan
    
7,162
      
5,294
  
Asia, excluding Japan
    
3,229
      
3,095
  
Europe
    
2,816
      
2,736
  
Rest of the world
    
5,248
      
4,501
  
Total consolidated revenue
   $
32,239
     $
36,026
  
Revenue mix by product category:
  
 
 
 
  
 
 
 
Products
   $
20,958
     $
27,209
  
Consumables
    
2,533
      
1,945
  
Skincare
    
2,900
      
1,608
  
Total product revenue
   $
26,391
     $
30,762
  
Service
    
5,848
      
5,264
  
Total consolidated revenue
   $
32,239
     $
36,026