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Intangible Assets
12 Months Ended
Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Note 9 - Intangible Assets
           

         
December 31
 
         
2018
   
2019
 
   
Useful life
   
US$ thousands
 
Original cost:
                 
Capitalization of software development costs
   
3
     
928
     
1,946
 
Licenses
   
3
     
106
     
106
 
             
1,034
     
2,052
 
Accumulated amortization:
                       
Capitalization of software development costs
           
37
     
274
 
Licenses
           
31
     
60
 
             
68
     
334
 
                         
Intangible assets, Net:
                       
Capitalization of software development costs
           
891
     
1,672
 
Licenses
           
75
     
46
 
             
966
     
1,718
 

Amortization expense for the years ended December 31, 2017, 2018 and 2019 were US$ 1,888 thousand, US$ 1,103 thousand and US$ 266 thousand, respectively.