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Note 5 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable securities (Note 3) | $ 64,867 | $ 77,469
Foreign exchange contracts | 56 |
Foreign exchange contracts |  | 77
Fair Value, Inputs, Level 1 [Member] |  |
Foreign exchange contracts |  |
Foreign exchange contracts |  |
Fair Value, Inputs, Level 2 [Member] |  |
Foreign exchange contracts | 56 |
Foreign exchange contracts |  | 77
Fair Value, Inputs, Level 3 [Member] |  |
Foreign exchange contracts |  |
Foreign exchange contracts |  |
Certificates of Deposits [Member] |  |
Marketable securities (Note 3) |  | 747
Certificates of Deposits [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Marketable securities (Note 3) |  |
Certificates of Deposits [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Marketable securities (Note 3) |  | 747
Certificates of Deposits [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Marketable securities (Note 3) |  |
Corporate Bonds [Member] |  |
Marketable securities (Note 3) | 64,867 | 76,226
Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Marketable securities (Note 3) |  |
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Marketable securities (Note 3) | 64,867 | 76,226
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Marketable securities (Note 3) |  |
Government Bonds [Member] |  |
Marketable securities (Note 3) |  | 496
Government Bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Marketable securities (Note 3) |  |
Government Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Marketable securities (Note 3) |  | 496
Government Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Marketable securities (Note 3) |  |

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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=118942338&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=118954083&loc=d3e26626-111562 + Details
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