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Note 6 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Corporate bonds | $ 83,884,000 | $ 88,754,000
Corporate Bonds [Member] |  |
Corporate bonds | 83,884,000 | 88,754
Foreign exchange contracts | 28,000 |
Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Corporate bonds | 0 | 0
Foreign exchange contracts | 0 |
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Corporate bonds | 83,884,000 | 88,754
Foreign exchange contracts | 28,000 |
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Corporate bonds | 0 | $ 0
Foreign exchange contracts | $ 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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