Marketable Securities

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Note 5 - Marketable 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.

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

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

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.