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Note 5 - Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

		March 31, 2021 (Unaudited)
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	12,553			$	61			$	(46	)		$	12,568
Available-for-sale - matures after one year through five years:
Corporate bonds			71,184				497				(365	)			71,316
Total		$	83,737			$	558			$	(411	)		$	83,884

		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

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 March 31, 2021 (unaudited)		$	32,679			$	(382	)		$	8,372			$	(29	)
As of December 31, 2020		$	31,393			$	(91	)		$	7,381			$	(21	)

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

		Three months ended March 31,
		2021 (unaudited)				2020 (unaudited)
Gross realized gains from sale of available-for-sale marketable securities		$	—			$	4
Gross realized losses from sale of available-for-sale marketable securities		$	—			$	(6	)

X

- 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.

+ References

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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)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

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