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Note 6 - Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

		September 30, 2021 (Unaudited)
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	5,410			$	25			$	—			$	5,435
Available-for-sale - matures after one year through five years:
Corporate bonds			68,661				466				(413	)			68,714
Total
		$	74,071			$	491			$	(413	)		$	74,149

		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

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 September 30, 2021 (unaudited)		$	26,507			$	(339	)		$	4,102			$	(74	)
As of December 31, 2020		$	31,393			$	(91	)		$	7,381			$	(21	)

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

		Nine months ended September 30,								Three months ended September 30,
		2021 (unaudited)				2020 (unaudited)				2021 (unaudited)				2020 (unaudited)
Gross realized gains from sale of available-for-sale marketable securities		$	43			$	4			$	—			$	—
Gross realized losses from sale of available-for-sale marketable securities		$	(30	)		$	(19	)		$	(2	)		$	—

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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