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Marketable Securities | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities |
Note 4 - Marketable Securities |  |  |  |  |  |  |
The Company's investment in marketable securities as of December 31, 2022 and 2023 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, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 8,022 |  |  |  | - |  |  |  | (121 | ) |  |  | 7,901 |
Non-Current (1 to 3 years) |  |  | 16,742 |  |  |  | - |  |  |  | (558 | ) |  |  | 16,184 |
|  |  | 24,764 |  |  |  | - |  |  |  | (679 | ) |  |  | 24,085 |
At December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 4,038 |  |  |  | - |  |  |  | (111 | ) |  |  | 3,927 |
Non-Current (1 to 4 years) |  |  | 15,283 |  |  |  | - |  |  |  | (1,214 | ) |  |  | 14,069 |
|  |  | 19,321 |  |  |  | - |  |  |  | (1,325 | ) |  |  | 17,996 |
* | Fair value is being determined using Level 2 inputs.
** | Including accrued interest in the amount of US$ 138 thousand and US$ 188 thousand as of December 31, 2022 and 2023, respectively.
| The accrued interest is presented as part of other receivables on the balance sheet.
Activity in marketable securities in 2023 and 2022 |  | US$ thousands |
Balance at January 1, 2022 |  |  | 32,266 |
Purchases of marketable securities |  |  | 3,998 |
Changes in marketable securities, net |  |  | (914 | )
Proceeds from maturity of marketable securities |  |  | (16,029 | )
Balance at January 1, 2023 |  |  | 19,321 |
Purchases of marketable securities |  |  | 9,623 |
Changes in marketable securities, net |  |  | (180 | )
Proceeds from maturity of marketable securities |  |  | (4,000 | )
Balance at December 31, 2023 |  |  | 24,764 |
The following table summarizes the gross unrealized losses or gains on investment securities 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 or gain position, at December 31, 2023:
|  | 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 |  |  | (99 | ) |  |  | 8,690 |  |  |  | (580 | ) |  |  | 15,395 |  |  |  | (679 | ) |  |  | 24,085 |
The unrealized losses or gains 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.

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