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Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 08, 2019 | Jul. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Payments to Acquire Intangible Assets |  |  | $ 0 | $ 1,690
Subsequent Event [Member] | Joint Venture in China in the Semiconductor Industry [Member] |  |  |  |
Equity Method Investment, Ownership Percentage | 19.90% |  |  |
Equity Method Investment, Aggregate Cost | $ 199 |  |  |
Subsequent Event [Member] | Licensing Agreements [Member] | Immervision [Member] |  |  |  |
Payments to Acquire Intangible Assets | $ 10,000 |  |  |
Subsequent Event [Member] | Acquisition of Hillcrest Labs [Member] |  |  |  |
Business Combination, Consideration Transferred, Total |  | $ 11,000 |  |
Payments to Acquire Businesses, Gross |  | 10,000 |  |
Business Combination, Amount Held in Escrow to Satisfy Possible Indemnification Claims |  | $ 1,000 |  |

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