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Marketable Securities | 12 Months Ended
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Dec. 31, 2014
Marketable Securities [Abstract] |
Marketable Securities | Note 5 - Marketable Securities The Company's investment in marketable securities as of December 31, 2013 and 2014 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, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  | 15,328 |  |  |  |  | - |  |  |  |  | (69 | ) |  |  |  | 15,259 |
Non-Current |  |  |  |  |  | 20,536 |  |  |  |  | - |  |  |  |  | (271 | ) |  |  |  | 20,265 |
|  |  |  |  |  | 35,864 |  |  |  |  | - |  |  |  |  | (340 | ) |  |  |  | 35,524 |
At December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
government debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  | 15,015 |  |  |  |  | 20 |  |  |  |  | (76 | ) |  |  |  | 14,959 |
Non-Current |  |  |  |  |  | 24,617 |  |  |  |  | 69 |  |  |  |  | (167 | ) |  |  |  | 24,519 |
|  |  |  |  |  | 39,632 |  |  |  |  | 89 |  |  |  |  | (243 | ) |  |  |  | 39,478 |
* | Fair value is being determined using quoted market prices in active markets (Level 1).
** | Including accrued interest in the amount of US$ 391 thousand and US$ 339 thousand as of December 31, 2013 and 2014 respectively.
| Activity in marketable securities in 2014 |  |  | US$ thousands
| Balance at January 1, 2014 |  |  |  |  |  |  |  |  | 39,632 |
| Purchases of marketable securities |  |  |  |  |  |  |  |  | 11,740 |
| Discount of marketable securities |  |  |  |  |  |  |  |  | (758 | )
| Proceeds from maturity of marketable securities |  |  |  |  |  |  |  |  | (14,750 | )
| Balance at December 31, 2014 |  |  |  |  |  |  |  |  | 35,864 |
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, 2014: |
|  |  |  |  | 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 |  |  |  |  |  | (170 | ) |  |  |  | 18,936 |  |  |  |  | (170 | ) |  |  |  | 15,573 |  |  |  |  | (340 | ) |  |  |  | 34,509 |  |
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.

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