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Note 17 - Geographic Revenue and Long-lived Assets Distribution (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
Revenue
    
Long-lived assets
  
   
Years ended December 31,
    
As of December 31,
  
(in thousands)
  
2018
    
2017
    
2016
    
2018
    
2017
  
United States
   $
16,442
     $
15,720
     $
10,372
     $
1,685
     $
1,071
  
United Kingdom
    
3,626
      
3,041
      
2,620
      
5,248
      
1,487
  
Europe and ROW (excluding United Kingdom)
    
5,527
      
5,095
      
4,368
      
101
      
132
  
Europe and ROW
    
9,153
      
8,136
      
6,988
      
5,349
      
1,619
  
Asia
    
34,158
      
30,877
      
29,628
      
110
      
74
  
Total
   $
59,753
     $
54,733
     $
46,988
     $
7,144
     $
2,764