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Intangible Assets
12 Months Ended
Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Note 8 - Intangible Assets
             
 
Intangible assets
 
Net intangible assets as of December 31, 2017 are as follows:
 
         
December 31
 
         
2016
   
2017
 
   
Useful life
   
US$ thousands
 
Original cost:
                 
Current technology
   
3
     
3,833
     
3,844
 
Customer relationships
   
3
     
1,937
     
1,937
 
             
5,770
     
5,781
 
Accumulated amortization:
                       
Current technology
           
1,930
     
3,181
 
Customer relationships
           
916
     
1,553
 
             
2,846
     
4,734
 
                         
Intangible assets, Net:
                       
Current technology
           
1,903
     
663
 
Customer relationships
           
1,021
     
384
 
             
2,924
     
1,047
 
 
 
Amortization expense for the years ended December 31, 2015, 2016 and 2017 were US$ 1,168 thousand, US$ 2,240 thousand and US$ 1,888 thousand, respectively.