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Note 1 - Organization and Summary of Significant Accounting Policies - Impact of Topic 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Total net revenue |  | $ 20,100 | $ 9,179
Total cost of revenue |  | 8,524 | 4,471
Net Income (loss) |  | 6,244 | 374
Service [Member] |  |  |
Total net revenue |  | 18,751 | 9,089
Total cost of revenue |  | 8,388 | 4,384
Product [Member] |  |  |
Total net revenue |  | 1,349 | 90
Total cost of revenue |  | $ 136 | $ 87
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Total net revenue | $ (123) |  |
Total cost of revenue | (24) |  |
Net Income (loss) | (99) |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Service [Member] |  |  |
Total net revenue | 636 |  |
Total cost of revenue | 209 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Product [Member] |  |  |
Total net revenue | (759) |  |
Total cost of revenue | $ (233) |  |

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