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Note 9 - Geographic Information and Major Customer Data (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2019 (unaudited) |  |  | 2018 (unaudited) |  |  | 2019 (unaudited) |  |  | 2018 (unaudited) |
Revenues based on customer location: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 7,713 |  |  | $ | 6,087 |  |  | $ | 3,811 |  |  | $ | 2,259 |
Europe and Middle East (1) |  |  | 13,245 |  |  |  | 11,305 |  |  |  | 6,911 |  |  |  | 6,139 |
Asia Pacific (2) (3) (4) |  |  | 37,882 |  |  |  | 39,084 |  |  |  | 12,749 |  |  |  | 13,015 |
|  | $ | 58,840 |  |  | $ | 56,476 |  |  | $ | 23,471 |  |  | $ | 21,413 |
(1) Germany |  | $ | 10,613 |  |  | $ | 8,582 |  |  | $ | 5,425 |  |  | $ | 5,600 |
(2) China |  | $ | 25,542 |  |  | $ | 23,127 |  |  | $ | 8,993 |  |  | $ | 10,192 |
(3) S. Korea |  | $ | *) |  |  | $ | 7,152 |  |  | $ | *) |  |  | $ | *) |
(4) Japan |  | $ | 6,544 |  |  | $ | 6,116 |  |  | $ | *) |  |  | $ | *) |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2019 (unaudited) |  |  | 2018 (unaudited) |  |  | 2019 (unaudited) |  |  | 2018 (unaudited) |
Customer A |  |  | 19 | % |  |  | 16 | % |  |  | 23 | % |  |  | 26 | %
Customer B |  |  | 15 | % |  |  | 16 | % |  |  | 15 | % |  |  | 16 | %
Customer C |  |  | *) |  |  |  | 12 | % |  |  | *) |  |  |  | *) |

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