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Note 6 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Marketable securities | $ 67,293 | $ 64,867
Foreign exchange contracts | 251 | 56
Fair Value, Inputs, Level 1 [Member] |  |
Foreign exchange contracts | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Foreign exchange contracts | 251 | 56
Fair Value, Inputs, Level 3 [Member] |  |
Foreign exchange contracts | 0 |
Corporate Bonds [Member] |  |
Marketable securities | 67,293 | 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 | 67,293 | 64,867
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Marketable securities | $ 0 | $ 0

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- 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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- 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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