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Note 11 - Segment Information and Revenue by Geograpy and Products (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Year Ended December 31,
  
   
201
7
    
201
6
    
201
5
  
Revenue mix by
geography:
  
 
 
 
  
 
 
 
  
 
 
 
United States
   $
94,581
     $
65,513
     $
48,916
  
Japan
    
17,264
      
14,727
      
11,504
  
Asia, excluding Japan
    
13,719
      
13,445
      
15,596
  
Europe
    
8,317
      
7,539
      
7,728
  
Rest of the
world
    
17,612
      
16,832
      
11,017
  
Consolidated total
   $
151,493
     $
118,056
     $
94,761
  
                         
Revenue mix by product category:
  
 
 
 
  
 
 
 
  
 
 
 
Products
   $
125,883
     $
92,721
     $
71,223
  
Hand Piece Refills
    
2,435
      
2,498
      
2,910
  
Skincare
    
4,342
      
3,809
      
2,889
  
Total product revenue
    
132,660
      
99,028
      
77,022
  
Service
    
18,833
      
19,028
      
17,739
  
Consolidated total
   $
151,493
     $
118,056
     $
94,761