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Note 7 - Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
Description |  | September 30 , 2019 (unaudited) |  |  | Level I (unaudited) |  |  | Level II (unaudited) |  |  | Level III (unaudited) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government bonds |  | $ | 500 |  |  | $ | — |  |  | $ | 500 |  |  | $ | — |
Corporate bonds |  |  | 69,962 |  |  |  | — |  |  |  | 69,962 |  |  |  | — |
Foreign exchange contracts |  |  | 20 |  |  |  | — |  |  |  | 20 |  |  |  | — |
Description |  | December 31, 2018 |  |  | Level I |  |  | Level II |  |  | Level III |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits |  | $ | 747 |  |  | $ | — |  |  | $ | 747 |  |  | $ | — |
Government bonds |  |  | 496 |  |  |  | — |  |  |  | 496 |  |  |  | — |
Corporate bonds |  |  | 76,226 |  |  |  | — |  |  |  | 76,226 |  |  |  | — |
Investment in other company (1) |  |  | 936 |  |  |  | — |  |  |  | — |  |  |  | 936 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  |  | 77 |  |  |  | — |  |  |  | 77 |  |  |  | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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