Note 3 - Marketable Securities

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Cash, Cash Equivalents, and Marketable Securities [Text Block]

NOTE 3: MARKETABLE SECURITIES

The following is a summary of available-for-sale marketable securities at December 31, 2022 and 2023:

	As at December 31, 2023
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Available-for-sale - matures within one year:
Corporate bonds	$	27,690	$	4	$	(243	)	$	27,451
Available-for-sale - matures after one year through three years:
Corporate bonds		108,700		278		(3,734	)		105,244
Total	$	136,390	$	282	$	(3,977	)	$	132,695

	As at December 31, 2022
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Available-for-sale - matures within one year:
Corporate bonds	$	17,552	$	—	$	(1,330	)	$	16,222
Available-for-sale - matures after one year through four years:
Corporate bonds		101,355		38		(5,535	)		95,858
Total	$	118,907	$	38	$	(6,865	)	$	112,080

The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of December 31, 2022 and 2023, and the length of time that those investments have been in a continuous loss position:

	Less than 12 months					12 months or greater
	Fair value		Gross unrealized loss			Fair value		Gross unrealized loss
As of December 31, 2023	$	18,193	$	(49	)	$	86,643	$	(3,928	)
As of December 31, 2022	$	58,706	$	(1,885	)	$	48,539	$	(4,980	)

During the years ended December 31, 2021, 2022 and 2023 the amount of credit losses recorded was not material.

The following table presents gross realized gains and losses from sale of available-for-sale marketable securities:

	Year ended December 31,
	2021			2022			2023
Gross realized gains from sale of available-for-sale marketable securities	$	43		$	—		$	114
Gross realized losses from sale of available-for-sale marketable securities	$	(30	)	$	(55	)	$	(24	)