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Note 2 - Revenue (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three months ended
September
30,
    
Nine
months ended
September
30,
  
(in thousands)
  
201
8
    
201
7
    
2018
    
201
7
  
Revenue
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Product
   $
15,095
     $
13,419
     $
40,236
     $
37,713
  
Service
    
955
      
1,592
      
4,150
      
4,411
  
Total revenue
   $
16,050
     $
15,011
     $
44,386
     $
42,124
  
   
Three months ended
September
30,
    
Nine
months ended
September
30,
  
(in thousands)
  
2018
    
201
7
    
2018
    
201
7
  
Revenue
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
United States
   $
2,876
     $
3,381
     $
11,615
     $
12,496
  
Europe and ROW
    
2,277
      
2,213
      
6,750
      
5,933
  
Asia
    
10,897
      
9,417
      
26,021
      
23,695
  
Total revenue
   $
16,050
     $
15,011
     $
44,386
     $
42,124