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Note 3 - Marketable Securities

12 Months Ended

Dec. 31, 2020

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, 2019 and 2020:

	As at December 31, 2020
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Available-for-sale - matures within one year:
Corporate bonds	$	12,667	$	49	$	(7	)	$	12,709

Available-for-sale - matures after one year through five years:
Corporate bonds		75,483		667		(105	)		76,045

Total	$	88,150	$	716	$	(112	)	$	88,754

	As at December 31, 2019
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Available-for-sale - matures within one year:
Corporate bonds	$	18,224	$	16	$	(11	)	$	18,229

Available-for-sale - matures after one year through five years:
Corporate bonds		46,593		168		(123	)		46,638

Total	$	64,817	$	184	$	(134	)	$	64,867

The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of December 31, 2019 and 2020, 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, 2020	$	31,393	$	(91	)	$	7,381	$	(21	)
As of December 31, 2019	$	22,852	$	(102	)	$	14,231	$	(32	)

During the years ended December 31, 2018, and 2019 the Company did not recognize any other-than temporary impairment losses. During the year ended December 31, 2020, with the adoption of ASU 2016-13, 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,
	2018			2019			2020

Gross realized gains from sale of available-for-sale marketable securities	$	4		$	13		$	14
Gross realized losses from sale of available-for-sale marketable securities	$	(71	)	$	(41	)	$	(20	)