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Note 2 - Revenue (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Year ended December 31,
  
(in thousands)
  
2019
    
2018
  
Revenue
      
 
      
 
Product
   $
69,763
     $
54,687
  
Service
    
3,947
      
5,066
  
Total revenue
   $
73,710
     $
59,753
  
   
Year ended December 31,
  
(in thousands, except percentages)
  
2019
    
2018
  
Revenue
      
 
      
 
      
 
      
 
United States
   $
24,177
      
33
 %   $
16,442
      
28
 %
Europe and ROW
    
10,421
      
14
 %    
9,153
      
15
 %
Asia
    
39,112
      
53
 %    
34,158
      
57
 %
Total revenue
   $
73,710
      
100
 %   $
59,753
      
100
 %