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Marketable Securities | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities |
Note 5 - Marketable Securities |  |  |  |  |  |  |  |
The Company's investment in marketable securities as of December 31, 2014 and 2015 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, 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 |
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 |
* | Fair value is being determined using quoted market prices in active markets (Level 1). |
** | Including accrued interest in the amount of US$ 339 thousand and US$ 256 thousand as of December 31, 2014 and 2015 respectively. The accrued interest is presented as part of other account receivable on the balance sheet. |
Activity in marketable securities in 2015 |  | US$ thousands |
Balance at January 1, 2015 |  |  | 35,864 |
Purchases of marketable securities |  |  | 12,935 |
Discount on marketable securities, net |  |  | (561 | )
Proceeds from maturity of marketable securities |  |  | (15,100 | )
Balance at December 31, 2015 |  |  | 33,138 |
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, 2015:
|  | 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 |  |  | (138 | ) |  |  | 12,789 |  |  |  | (207 | ) |  |  | 20,004 |  |  |  | (345 | ) |  |  | 32,793 |
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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