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Note 9 - Geographic Information and Major Customer Data (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2021 (unaudited) |  |  | 2020 (unaudited) |  |  | 2021 (unaudited) |  |  | 2020 (unaudited) |
Revenues based on customer location: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 19,290 |  |  | $ | 13,754 |  |  | $ | 8,792 |  |  | $ | 3,079 |
Europe and Middle East |  |  | 3,435 |  |  |  | 10,017 |  |  |  | 1,430 |  |  |  | 825 |
Asia Pacific (1) |  |  | 65,914 |  |  |  | 48,410 |  |  |  | 22,558 |  |  |  | 21,056 |
Other |  |  | 10 |  |  |  | — |  |  |  | 10 |  |  |  | — |
|  | $ | 88,649 |  |  | $ | 72,181 |  |  | $ | 32,790 |  |  | $ | 24,960 |
(1) China |  | $ | 54,489 |  |  | $ | 37,713 |  |  | $ | 18,041 |  |  | $ | 16,085 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2021 (unaudited) |  |  | 2020 (unaudited) |  |  | 2021 (unaudited) |  |  | 2020 (unaudited) |
Customer A |  |  | 25 | % |  |  | 12 | % |  |  | 32 | % |  |  | 18 | %
Customer B |  |  | *) |  |  |  | 13 | % |  |  | *) |  |  |  | *) |
Customer C |  |  | *) |  |  |  | 13 | % |  |  | *) |  |  |  | 16 | %

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