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Note 8 - Geographic Information and Major Customer Data (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Six months ended June 3 0, |  |  | Three months ended June 3 0, |
|  | 20 20 |  |  | 20 1 9 |  |  | 20 20 |  |  | 20 1 9 |
|  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |
Revenues based on customer location: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 5,919 |  |  | $ | 3,902 |  |  | $ | 2,624 |  |  | $ | 2,123 |
Europe and Middle East (1) |  |  | 13,948 |  |  |  | 6,334 |  |  |  | 8,845 |  |  |  | 2,992 |
Asia Pacific (2) (3) |  |  | 27,354 |  |  |  | 25,133 |  |  |  | 12,137 |  |  |  | 13,285 |
|  | $ | 47,221 |  |  | $ | 35,369 |  |  | $ | 23,606 |  |  | $ | 18,400 |
(1) Germany |  | $ | 8,889 |  |  | $ | 5,188 |  |  | $ | 4,925 |  |  | $ | 2,599 |
(2) China |  | $ | 21,628 |  |  | $ | 16,549 |  |  | $ | 9,554 |  |  | $ | 9,306 |
(3) Japan |  | $ | *) |  |  | $ | 4,835 |  |  | $ | *) |  |  | $ | 2,188 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Six months ended June 3 0, |  |  | Three months ended June 3 0, |
|  | 20 20 |  |  | 20 1 9 |  |  | 20 20 |  |  | 20 1 9 |
|  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |
Customer A |  |  | 18 | % |  |  | 17 | % |  |  | 20 | % |  |  | 14 | %
Customer B |  |  | )* |  |  |  | 15 | % |  |  | )* |  |  |  | 17 | %
Customer C |  |  | 11 | % |  |  | )* |  |  |  | 18 | % |  |  | )* |

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