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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Held-to-Maturity Securities

The Company's investment in marketable securities as of December 31, 2019 and 2020 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, 2020
Held to maturity:
Corporate debt securities and government debt securities
Current			35,445				265				(102	)			35,608
Non-Current			15,365				339				-				15,704
			50,810				604				(102	)			51,312
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

*	Fair value is being determined using quoted market prices in active markets (Level 2).
**	Including accrued interest in the amount of US$ 538 thousand and US$ 412 thousand as of December 31, 2019 and 2020, respectively.
	The accrued interest is presented as part of other receivables on the balance sheet.

Schedule of Reconciliation of Marketable Securities

Activity in marketable securities in 2020		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 December 31, 2020			50,810

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, 2020:

		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			(2	)			1,105				(100	)			6,770				(102	)			7,875

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Schedule Of Reconciliation Of Marketable Securities [Table Text Block]

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Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269825-111563

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

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Tabular disclosure of unrealized gains and losses on investments.

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