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Note 2 - Revenue (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three
months ended
March 31
,
  
(in thousands)
  
201
9
    
201
8
  
Revenue
  
 
 
 
  
 
 
 
Product
   $
13,841
     $
10,129
  
Service
    
948
      
1,550
  
Total revenue
   $
14,789
     $
11,679
  
   
Three months ended
March 31
,
  
(in thousands)
  
201
9
    
201
8
  
Revenue
  
 
 
 
  
 
 
 
United States
   $
5,531
     $
3,698
  
Europe and ROW
    
2,762
      
2,236
  
Asia
    
6,496
      
5,745
  
Total revenue
   $
14,789
     $
11,679