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Note 7 - Goodwill and Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Goodwill [Table Text Block] |
|  | Year ended December 3 1, |
|  | 2018 |  |  | 2019 |
Balance as of January 1, |  | $ | 46,612 |  |  | $ | 46,612 |
Acquisition |  |  | — |  |  |  | 4,458 |
Balance as of December 31, |  | $ | 46,612 |  |  | $ | 51,070 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  |  |  | Year ended December 31, 2018 |  |  | Year ended December 31, 2019 |
|  | Weighted average amortization p eriod (years) |  |  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net |  |  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net |
Intangible assets –amortizable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets related to the acquisition of RivieraWaves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 4.5 |  |  | $ | 272 |  |  | $ | 272 |  |  | $ | — |  |  | $ | 272 |  |  | $ | 272 |  |  | $ | — |
Customer backlog |  | 1.5 |  |  |  | 93 |  |  |  | 93 |  |  |  | — |  |  |  | 93 |  |  |  | 93 |  |  |  | — |
Core technologies |  | 5.1 |  |  |  | 5,796 |  |  |  | 4,955 |  |  |  | 841 |  |  |  | 5,796 |  |  |  | 5,796 |  |  |  | — |
I ntangible assets related to the acquisition of Hillcrest Lab s busines s |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 4.4 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,518 |  |  |  | 395 |  |  |  | 3,123 |
Customer backlog |  | 0.5 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 72 |  |  |  | 65 |  |  |  | 7 |
Core technologies |  | 7.5 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,475 |  |  |  | 150 |  |  |  | 2,325 |
Intangible assets related to a technology investment in Immervision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core technologies |  | 6.4 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,063 |  |  |  | 472 |  |  |  | 6,591 |
Intangible assets related to an investment in NB-IoT technologies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NB-IoT technologies (*) |  | 7.0 |  |  |  | 2,200 |  |  |  | 341 |  |  |  | 1,859 |  |  |  | 1,961 |  |  |  | 583 |  |  |  | 1,378 |
Total intangible assets |  |  |  |  | $ | 8,361 |  |  | $ | 5,661 |  |  | $ | 2,700 |  |  | $ | 21,250 |  |  | $ | 7,826 |  |  | $ | 13,424 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
2020 |  | $ | 2,588 |
2021 |  |  | 2,582 |
2022 |  |  | 2,581 |
2023 |  |  | 1,906 |
2024 |  |  | 1,852 |
2025 and thereafter |  |  | 1,915 |
|  | $ | 13,424 |

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