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Note 5 - Geographic Information and Major Customer and Product Data (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
    Three Months Ended
June 30,		   Six Months Ended
June 30,
    2017   2016   2017   2016
    (unaudited)   (unaudited)
    (in thousands)   (in thousands)
                 
Revenues based on customer’s location:                                
United States   $
33,135
     $
24,330
     $
57,544
     $
41,845
  
EMEA (*)    
13,879
      
11,857
      
27,120
      
22,354
  
Rest of World    
3,160
      
2,454
      
5,890
      
4,912
  
                                 
Total revenues   $
50,174
     $
38,641
     $
90,554
     $
69,111
  
Long-lived Assets by Geographic Areas [Table Text Block]
    June 30,
2017		   December 31,
2016
    (unaudited)    
    (in thousands)
Long-lived assets by geographic region:                
United States   $
7,352
     $
7,664
  
Israel    
2,731
      
1,827
  
Other    
1,077
      
419
  
                 
    $
11,160
     $
9,910