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Note 8 - Geographic Information and Major Customer Data (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three months ended March 31, |
|  | 2021 (unaudited) |  |  | 2020 (unaudited) |
Revenues based on customer location: |  |  |  |  |  |  |  |
United States |  | $ | 3,950 |  |  | $ | 3,295 |
Europe and Middle East (1) |  |  | 1,099 |  |  |  | 5,103 |
Asia Pacific (2) |  |  | 20,353 |  |  |  | 15,217 |
|  | $ | 25,402 |  |  | $ | 23,615 |
(1) Germany |  | $ | *) |  |  | $ | 3,964 |
(2) China |  | $ | 17,259 |  |  | $ | 12,074 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three months ended March 31, |
|  | 2021 (unaudited) |  |  | 2020 (unaudited) |
Customer A |  |  | 23 | % |  |  | *) |
Customer B |  |  | 14 | % |  |  | *) |
Customer C |  |  | 12 | % |  |  | *) |
Customer D |  |  | *) |  |  |  | 16 | %

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