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Note 8 - Geographic Information and Major Customer Data (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Six months ended June 3 0 , |  |  | Three months ended June 3 0 , |
|  | 201 9 (unaudited) |  |  | 201 8 (unaudited) |  |  | 201 9 (unaudited) |  |  | 201 8 (unaudited) |
Revenues based on customer location: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 3,902 |  |  | $ | 3,828 |  |  | $ | 2,123 |  |  | $ | 2,121 |
Europe and Middle East (1) |  |  | 6,334 |  |  |  | 5,166 |  |  |  | 2,992 |  |  |  | 2,713 |
Asia Pacific (2) (3) (4) |  |  | 25,133 |  |  |  | 26,069 |  |  |  | 13,285 |  |  |  | 12,660 |
|  | $ | 35,369 |  |  | $ | 35,063 |  |  | $ | 18,400 |  |  | $ | 17,494 |
(1) Germany |  | $ | 5,188 |  |  | $ | *) |  |  | $ | 2,599 |  |  | $ | 1,895 |
(2) China |  | $ | 16,549 |  |  | $ | 12,935 |  |  | $ | 9,306 |  |  | $ | 6,802 |
(3) S. Korea |  | $ | *) |  |  | $ | 5,679 |  |  | $ | *) |  |  | $ | 2,877 |
(4) Japan |  | $ | 4,835 |  |  | $ | 5,147 |  |  | $ | 2,188 |  |  | $ | 2,523 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Six months ended June 3 0 , |  |  | Three months ended June 3 0 , |
|  | 201 9 (unaudited) |  |  | 201 8 (unaudited) |  |  | 201 9 (unaudited) |  |  | 201 8 (unaudited) |
Customer A |  |  | 17 | % |  |  | 11 | % |  |  | 14 | % |  |  | 16 | %
Customer B |  |  | 15 | % |  |  | 16 | % |  |  | 17 | % |  |  | 17 | %
Customer C |  |  | *) |  |  |  | 15 | % |  |  | *) |  |  |  | 16 | %

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