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Cash and Cash Equivalents
12 Months Ended
Dec. 31, 2016
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents
Note 4 - Cash and Cash Equivalents
         
 
   
December 31
 
   
2015
   
2016
 
   
US$ thousands
 
             
Cash
   
12,329
     
5,858
 
Cash equivalents *
   
5,849
     
6,059
 
     
18,178
     
11,917
 
 
 
*
Comprised mainly of deposits in banks as at December 31, 2015 and 2016 carrying a weighted average interest rate of 0.11% and 0.30%, respectively.