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Cash and Cash Equivalents
12 Months Ended
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents
Note 4 - Cash and Cash Equivalents
       
 
   
December 31
 
   
2016
   
2017
 
   
US$ thousands
 
             
Cash
   
5,858
     
12,834
 
Cash equivalents *
   
6,059
     
4,187
 
     
11,917
     
17,021
 
 
*
 
Comprised mainly of deposits in banks as at December 31, 2016 and 2017 carrying a weighted average interest rate of 0.30% and 0.07%, respectively.