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Note 5 - Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

		March 31, 2022 (Unaudited)
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	11,089			$	6			$	(7	)		$	11,088
Available-for-sale - matures after one year through five years:
Corporate bonds			84,934				15				(3,412	)			81,537
Total		$	96,023			$	21			$	(3,419	)		$	92,625

		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

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 March 31, 2022 (unaudited)		$	65,075			$	(2,457	)		$	16,913			$	(962	)
As of December 31, 2021		$	53,412			$	(667	)		$	12,039			$	(158	)

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455

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- Definition

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

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