XML 43 R28.htm IDEA: XBRL DOCUMENT
v3.20.1

Marketable Securities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Held-to-Maturity Securities | The Company's investment in marketable securities as of December 31, 2018 and 2019 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, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 14,170 |  |  |  | 24 |  |  |  | (97 | ) |  |  | 14,097 |
Non-Current |  |  | 46,955 |  |  |  | 408 |  |  |  | (112 | ) |  |  | 47,251 |
|  |  | 61,125 |  |  |  | 432 |  |  |  | (209 | ) |  |  | 61,348 |
At December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 1,610 |  |  |  | - |  |  |  | (22 | ) |  |  | 1,588 |
Non-Current |  |  | 46,052 |  |  |  | - |  |  |  | (778 | ) |  |  | 45,274 |
|  |  | 47,662 |  |  |  | - |  |  |  | (800 | ) |  |  | 46,862 |
* | Fair value is being determined using quoted market prices in active markets (Level 2).
** | Including accrued interest in the amount of US$ 450 thousand and US$ 538 thousand as of December 31, 2018 and 2019 respectively. The accrued interest is presented as part of other account receivable on the balance sheet.
Schedule of Reconciliation of Marketable Securities |
Activity in marketable securities in 2019 |  | US$ thousands |
Balance at January 1, 2019 |  |  | 47,662 |
Purchases of marketable securities |  |  | 15,604 |
Discount on marketable securities, net |  |  | (144 | )
Proceeds from maturity of marketable securities |  |  | (1,997 | )
Balance at December 31, 2019 |  |  | 61,125 |
Summary of Investment Securities in an Unrealized Loss Position | 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, 2019:
|  | 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 and government debt securities |  |  | (38 | ) |  |  | 4,968 |  |  |  | (171 | ) |  |  | 20,100 |  |  |  | (209 | ) |  |  | 25,068 |

X
- Definition Schedule Of Reconciliation Of Marketable Securities [Table Text Block] + References No definition available. + Details
Name: | silc_ScheduleOfReconciliationOfMarketableSecuritiesTableTextBlock
Namespace Prefix: | silc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
Name: | us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration