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Marketable Securities | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Note 5 - Marketable Securities The Company's investment in marketable securities as of December 31, 2020 and 2021 are classified as ''held-to-maturity'' and consist of the following:
|  | Amortized cost basis** |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding (losses) |  |  | Aggregate fair value* |
|  | US$ thousands |
At December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 8,300 |  |  |  | 43 |  |  |  | (19 | ) |  |  | 8,324 |
Non-Current (1 to 4 years) |  |  | 23,966 |  |  |  | 10 |  |  |  | (512 | ) |  |  | 23,464 |
|  |  | 32,266 |  |  |  | 53 |  |  |  | (531 | ) |  |  | 31,788 |
At December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 35,445 |  |  |  | 265 |  |  |  | (102 | ) |  |  | 35,608 |
Non-Current (1 to 5 years) |  |  | 15,365 |  |  |  | 339 |  |  |  | - |  |  |  | 15,704 |
|  |  | 50,810 |  |  |  | 604 |  |  |  | (102 | ) |  |  | 51,312 |
* | Fair value is being determined using Level 2 inputs.
** | Including accrued interest in the amount of US$ 412 thousand and US$ 227 thousand as of December 31, 2020 and 2021, respectively.
| The accrued interest is presented as part of other receivables on the balance sheet.
Activity in marketable securities in 2021 |  | US$ thousands |
Balance at January 1, 2020 |  |  | 61,125 |
Purchases of marketable securities |  |  | 6,558 |
Discount on marketable securities, net |  |  | (244 | )
Proceeds from maturity of marketable securities |  |  | (16,629 | )
Balance at January 1, 2021 |  |  | 50,810 |
Purchases of marketable securities |  |  | 19,927 |
Discount on marketable securities, net |  |  | (621 | )
Proceeds from maturity of marketable securities |  |  | (37,850 | )
Balance at December 31, 2021 |  |  | 32,266 |
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, 2021:
|  | 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 |  |  | (531 | ) |  |  | 25,814 |  |  |  | — |  |  |  | — |  |  |  | (531 | ) |  |  | 25,814 |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
Held to maturity: |  | Unrealized Gains |  |  | Fair value |  |  | Unrealized Gains |  |  | Fair value |  |  | Unrealized Gains |  |  | Fair value |
Corporate debt securities and government debt securities |  |  | — |  |  |  | — |  |  |  | 53 |  |  |  | 5,974 |  |  |  | 53 |  |  |  | 5,974 |
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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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