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Note 3 - Acquisitions - Purchase Price Allocation for Hillcrest Labs Acquisition (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jul. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Goodwill | $ 51,070 |  | $ 46,612 | $ 46,612
Acquisition of Hillcrest Labs [Member] |  |  |  |
Tangible assets (including inventory, property and equipment and other) |  | $ 681 |  |
Goodwill |  | 4,458 |  |
Total assets |  | 11,204 |  |
Acquisition of Hillcrest Labs [Member] | Developed Technology Rights [Member] |  |  |  |
Intangible assets |  | 2,475 |  |
Acquisition of Hillcrest Labs [Member] | Customer Relationships [Member] |  |  |  |
Intangible assets |  | 3,518 |  |
Acquisition of Hillcrest Labs [Member] | Customer Backlog [Member] |  |  |  |
Intangible assets |  | $ 72 |  |

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