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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