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Note 10 - Segment Information and Revenue by Geography and Products (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Year Ended December 31,
  
   
201
8
    
201
7
    
201
6
  
Revenue mix by geography:
  
 
 
 
  
 
 
 
  
 
 
 
United States
   $
101,862
     $
94,581
     $
65,513
  
Japan
    
17,819
      
17,264
      
14,727
  
Asia, excluding Japan
    
15,467
      
13,719
      
13,445
  
Europe
    
8,875
      
8,317
      
7,539
  
Rest of the world
    
18,696
      
17,612
      
16,832
  
Total Consolidated revenue
   $
162,720
     $
151,493
     $
118,056
  
Revenue mix by product category:
  
 
 
 
  
 
 
 
  
 
 
 
Systems
   $
132,594
     $
125,883
     $
92,721
  
Consumables
    
4,162
      
2,435
      
2,498
  
Skincare
    
5,778
      
4,342
      
3,809
  
Total product revenue
    
142,535
      
132,660
      
99,028
  
Service
    
20,185
      
18,833
      
19,028
  
Total Consolidated revenue
   $
162,720
     $
151,493
     $
118,056