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Financial Income (Expenses), Net (Tables)
12 Months Ended
Dec. 31, 2012
Financial Income (Expenses), Net [Abstract]  
Financial Income (Expenses), Net
   
Year ended December 31
 
   
2010
   
2011
   
2012
 
   
US$ thousands
 
Interest income
    1,277       1,292       1,360  
Interest expenses
    (416     (499 )     (561 )
Exchange rate differences, net
    (130     (231 )     96  
Bank charges
    (114     (123 )     (143 )
                         
      617       439       752