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Note 3 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
Jul. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Payments to Acquire Businesses, Gross         $ 11,000
Payments to Acquire Intangible Assets         10,140 $ 1,960
Licensing Agreements [Member] | Immervision [Member]            
Payments to Acquire Intangible Assets $ 10,000          
Acquisition of Hillcrest Labs [Member]            
Business Combination, Consideration Transferred, Total   $ 11,204        
Payments to Acquire Businesses, Gross   10,000        
Business Combination, Amount Held in Escrow to Satisfy Possible Indemnification Claims   1,000        
Business Combination, Contingent Consideration, Liability, Total   $ 204        
Business Combination, Acquisition Related Costs       $ 846 $ 846  
Acquisition of Hillcrest Labs [Member] | Forecast [Member]            
Payments to Acquire Businesses, Gross     $ 204