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Note 3 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

		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

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

		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	)

Schedule of Realized Gain (Loss) [Table Text Block]

		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	)

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- Definition

Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.

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Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

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