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Note 6 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Marketable securities	$ 78,506	$ 64,867
Foreign exchange contracts	26	56
Fair Value, Inputs, Level 1 [Member]
Foreign exchange contracts	0	0
Fair Value, Inputs, Level 2 [Member]
Foreign exchange contracts	26	56
Fair Value, Inputs, Level 3 [Member]
Foreign exchange contracts	0
Corporate Bonds [Member]
Marketable securities	78,506	64,867
Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable securities	0	0
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Marketable securities	78,506	64,867
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Marketable securities	$ 0	$ 0

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&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 http://asc.fasb.org/extlink&oid=121553693&loc=d3e26626-111562

+ Details

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Period Type:	instant

X

- Definition

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

No definition available.

+ Details

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- Details

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