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Note 5 - Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

		September 30, 2020 (Unaudited)
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	12,486			$	72			$	—			$	12,558
			12,486				72				—				12,558
Available-for-sale - matures after one year through five years:
Corporate bonds			65,606				610				(268	)			65,948
			65,606				610				(268	)			65,948
Total		$	78,092			$	682			$	(268	)		$	78,506

		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
			18,224				16				(11	)			18,229
Available-for-sale - matures after one year through five years:
Corporate bonds			46,593				168				(123	)			46,638
			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 September 30, 2020 (unaudited)		$	34,352			$	(233	)		$	4,559			$	(35	)
As of December 31, 2019		$	22,852			$	(102	)		$	14,231			$	(32	)

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

		Nine months ended September 30,								Three months ended September 30,
		2020 (unaudited)				2019 (unaudited)				2020 (unaudited)				2019 (unaudited)
Gross realized gains from sale of available-for-sale marketable securities		$	4			$	1			$	—			$	1
Gross realized losses from sale of available-for-sale marketable securities		$	(19	)		$	(39	)		$	—			$	(4	)

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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 reconciliation of available-for-sale securities from cost basis to fair value.

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- Definition

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)
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