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Note 6 - Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

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

		June 30, 2023 (Unaudited)
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	29,099			$	—			$	(1,616	)		$	27,483
Available-for-sale - matures after one year through four years:
Corporate bonds			74,640				3				(4,423	)			70,220
Total
		$	103,739			$	3			$	(6,039	)		$	97,703

		December 31, 2022
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	17,552			$	—			$	(1,330	)		$	16,222
Available-for-sale - matures after one year through five years:
Corporate bonds			101,355				38				(5,535	)			95,858
Total		$	118,907			$	38			$	(6,865	)		$	112,080

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 June 30, 2023 (unaudited)		$	18,905			$	(268	)		$	77,534			$	(5,771	)
As of December 31, 2022		$	58,706			$	(1,885	)		$	48,539			$	(4,980	)

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

		Six months ended June 30,								Three months ended June 30,
		2023				2022				2023				2022
		(unaudited)				(unaudited)				(unaudited)				(unaudited)
Gross realized gains from sale of available-for-sale marketable securities		$	92			$	—			$	—			$	—
Gross realized losses from sale of available-for-sale marketable securities		$	(16	)		$	(21	)		$	(16	)		$	(21	)

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479081/326-30-55-8

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-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-6

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
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+ References

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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

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-Section 50
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