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Note 10 - Segment Information and Revenue by Geography and Products (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Year Ended December 31,
  
   
201
9
    
201
8
    
201
7
  
Revenue mix by geography:
  
 
 
 
  
 
 
 
  
 
 
 
United States
   $
106,243
     $
101,862
     $
94,581
  
Japan
    
24,142
      
17,819
      
17,264
  
Asia, excluding Japan
    
16,110
      
15,467
      
13,719
  
Europe
    
10,596
      
8,875
      
8,317
  
Rest of the world
    
24,620
      
18,696
      
17,612
  
Total Consolidated revenue
   $
181,712
     $
162,720
     $
151,493
  
Revenue mix by product category:
  
 
 
 
  
 
 
 
  
 
 
 
Systems
   $
140,478
     $
132,594
     $
125,883
  
Consumables
    
9,648
      
4,162
      
2,435
  
Skincare
    
8,512
      
5,778
      
4,342
  
Total product revenue
    
158,638
      
142,535
      
132,660
  
Service
    
23,074
      
20,185
      
18,833
  
Total Consolidated revenue
   $
181,712
     $
162,720
     $
151,493