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Note 3 - Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

		As at December 31, 2021
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	11,937			$	39			$	(7	)		$	11,969
Available-for-sale - matures after one year through five years:
Corporate bonds			78,920				227				(818	)			78,329
Total		$	90,857			$	266			$	(825	)		$	90,298

		As at December 31, 2020
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Amortized cost
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

Debt Securities, Available-for-sale, 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, 2021		$	53,412			$	(667	)		$		12,039			$	(158	)
As of December 31, 2020		$	31,393			$	(91	)		$		7,381			$	(21	)

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

		Year ended December 31,
		2019				2020				2021
Gross realized gains from sale of available-for-sale marketable securities		$	13			$	14			$	43
Gross realized losses from sale of available-for-sale marketable securities		$	(41	)		$	(20	)		$	(30	)

X

- Definition

Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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