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Marketable Securities
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Note 5 - Marketable Securities
              
 
The Company's investment in marketable securities as of December 31, 2015 and 2016 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 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
  
                                 
At December 31, 2015
                                
Held to maturity:
                                
Corporate debt securities
                                
Current
    
8,720
      
-
      
(90
)
    
8,630
  
Non-Current
    
24,418
      
-
      
(255
)
    
24,163
  
                                 
     
33,138
      
-
      
(345
)
    
32,793
  
 
 
*
Fair value is being determined using quoted market prices in active markets (Level 1).
**
Including accrued interest in the amount of US$ 256 thousand and US$ 173 thousand as of December 31, 2015 and 2016 respectively.
The accrued interest is presented as part of other account receivable on the balance sheet.
 
Activity in marketable securities in 2016
  
US$ thousands
  
       
Balance at January 1, 2016
    
33,138
  
         
Discount on marketable securities, net
    
(358
)
Proceeds from maturity of marketable securities
    
(8,575
)
Balance at December 31, 2016
    
24,205
  
 
 
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, 2016:
 
   
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
    
-
      
-
      
(159
)
    
24,046
      
(159
)
    
24,046
  
 
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.