Note 6 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Corporate bonds	$ 92,625	$ 90,298
Foreign exchange contract	186	63
Investments in marketable equity securities	1,788	2,919
Foreign exchange contract	11
Fair Value, Inputs, Level 1 [Member]
Foreign exchange contract	0	0
Investments in marketable equity securities	1,788	2,919
Foreign exchange contract	0
Fair Value, Inputs, Level 2 [Member]
Foreign exchange contract	186	63
Investments in marketable equity securities	0	0
Foreign exchange contract	11
Fair Value, Inputs, Level 3 [Member]
Foreign exchange contract	0	0
Investments in marketable equity securities	0	0
Foreign exchange contract	0
Corporate Bonds [Member]
Corporate bonds	92,625	90,298
Corporate Bonds [Member] \| Fair Value, Inputs, Level 1 [Member]
Corporate bonds	0	0
Corporate Bonds [Member] \| Fair Value, Inputs, Level 2 [Member]
Corporate bonds	92,625	90,298
Corporate Bonds [Member] \| Fair Value, Inputs, Level 3 [Member]
Corporate bonds	$ 0	$ 0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26626-111562

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

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+ References

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Amount of investment in marketable security, classified as current.

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