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Note 12 - Geographic Information and Major Customer and Product Data (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
   
Year ended December 31,
 
   
2017
   
2018
   
2019
 
Revenues based on customer location:
                       
United States
  $
7,188
    $
8,354
    $
16,627
 
Europe, Middle East (3)
   
11,007
     
17,370
     
21,493
 
Asia Pacific (1) (2)
   
69,312
     
52,153
     
49,032
 
    $
87,507
    $
77,877
    $
87,152
 
                         
(1)  China
  $
41,059
    $
33,672
    $
33,233
 
(2)  S. Korea
  $
17,842
    $
7,989
     
*)
 
(3)  Germany
   
*)
    $
13,873
    $
16,100
 
                         
*) Less than 10%
                       
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
   
2018
   
2019
 
Long-lived assets by geographic region:
               
Israel
  $
6,599
    $
15,032
 
France
   
451
     
605
 
United States
   
156
     
1,356
 
Other
   
138
     
1,952
 
    $
7,344
    $
18,945
 
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Year ended December 31,
 
   
2017
   
2018
   
2019
 
Customer A
   
23
%    
15
%    
15
%
Customer B
   
17
%    
 *)
     
 *)
 
Customer C
   
 *)
     
19
%    
19
%
Revenue from External Customers by Products and Services [Table Text Block]
   
Year ended December 31,
 
   
2017
   
2018
   
2019
 
Connectivity products
   
78
%    
84
%    
81
%
Smart sensing products
   
22
%    
16
%    
19
%