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Marketable Securities
 12 Months Ended
Dec. 31, 2012
Marketable Securities [Abstract]  
Marketable Securities
Note 4 - Marketable Securities

The Company's investment in marketable securities as of December 31, 2011 and 2012 are classified as "held-to-maturity" and consist of the following:

         
Gross
    
Gross
        
         
unrealized
    
unrealized
        
   
Aggregate
    
holding
    
holding
    
Aggregate
  
   
cost basis**
    
gains
    
(losses)
    
fair value*
  
   
US$ thousands
  
At December 31, 2011
                        
Held to maturity:
                        
Corporate debt securities and
                        
  government debt securities
                        
Current
     9,108       5       (100 )     9,013  
Non-Current
     23,911       -       (452 )     23,459  
                                 
      33,019       5       (552 )     32,472  
                                 
At December 31, 2012
                                
Held to maturity:
                                
Corporate debt securities and
                                
  government debt securities
                                
Current
     12,702       23       (56 )     12,669  
Non-Current
     28,775       193       (126 )     28,842  
                                 
      41,477       216       (182 )     41,511  
 
*         Fair value is being determined using quoted market prices in active markets (Level 1).
 
**
Including accrued interest in the amount of $325K and $425K as of December 31, 2011 and 2012 respectively.

 
The amortized cost, gross unrealized losses and fair value of the debt securities by major interest type were as follows:

   
December 31, 2011
  
         
Net unrealized
        
   
Amortized cost
    
holding gains/(losses)
    
Fair value
  
   
US$ thousands
  
Up to 2%
     25,225       (415 )     24,810  
2.038% - 2.874%     7,794       (132 )     7,662  
      33,019       (547 )     32,472  
 
   
December 31, 2012
  
         
Net unrealized
        
   
Amortized cost
    
holding gains/(losses)
    
Fair value
  
   
US$ thousands
  
Up to 2%
     33,145       (84 )     33,061  
2.038% - 2.951%
     8,332       118       8,450  
      41,477       34       41,511  
 
Activity in Marketable securities in 2012

   
US$ thousands
  
Balance at January 1, 2012
     33,019  
         
Purchases of marketable securities
     17,992  
Discount of marketable securities
     (579 )
Proceeds from maturity of marketable securities
     (8,955 )
Balance at December 31, 2012
     41,477  

 
The following table summarizes the gross unrealized losses on investment securities for which other-than-temporary impairments have not been recognized and the fair value of those securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2012:
 
    Less than 12 months     12 months or more     Total  
Held to maturity
  
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
  
                                     
Corporate debt securities
                                    
 and government debt
                                    
 securities
     (106 )     6,803       (76 )     10,701       (182 )     17,504  

The unrealized losses on the investments were caused by interest rate increases. The Company has the ability and intent to hold these investments until maturity and it is more likely than not that the Company will not be required to sell any of the securities before recovery; therefore these investments are not considered other than temporarily impaired.