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Marketable Securities
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
 
Note 3 - Marketable Securities
              
  
The Company's investment in marketable securities as of December 31, 2016 and June 30, 2017 are classified as “held-to-maturity” and consist of the following:
 
         
Gross
    
Gross
        
         
unrealized
    
unrealized
        
   
Amortized
    
holding
    
holding
    
Aggregate
  
   
cost basis**
    
gains
    
(losses)
    
fair value*
  
   
US$ thousands
  
At June 30, 2017
                        
Held to maturity:
                        
Corporate debt securities
                        
Current
    
13,592
      
-
      
(66
)
    
13,526
  
                                 
At December 31, 2016
                                
Held to maturity:
                                
Corporate debt securities
                                
Current
    
16,390
      
-
      
(97
)
    
16,293
  
Non-Current
    
7,815
      
-
      
(62
)
    
7,753
  
                                 
     
24,205
      
-
      
(159
)
    
24,046
  
 
 
*
Fair value is being determined using quoted market prices in active markets (Level 1).
 
**
Including accrued interest in the amount of US$ 173 thousands and US$ 115 thousands as of December 31, 2016 and June 30, 2017 respectively.
 
Activity in marketable securities in six month period ended in June 30, 2017:
 
   
US$ thousands
  
Balance at January 1, 2017
    
24,205
  
         
Discount on marketable securities, net
    
(138
)
Proceeds from maturity of marketable securities
    
(10,475
)
Balance at June 30, 2017
    
13,592
  
 
 
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 June 30, 2017:
 
   
Less than 12 months
    
12 months or more
    
Total
  
   
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
  
Held to maturity
                                     
Corporate debt securities
    
-
      
-
      
(66
)
    
13,526
      
(66
)
    
13,526
  
 
The unrealized losses on the investments were caused by changes in interest rate. 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.