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Note 3 - Acquisitions of Ownership Interests (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Payments to Acquire Equity Method Investments   $ 7,510 $ 9,500  
Equity Method Investments   30,707   $ 34,542
Aktana, Inc. [Member]        
Payments to Acquire Equity Method Investments   2,500    
Equity Method Investments     11,700  
meQuilibrium [Member]        
Payments to Acquire Equity Method Investments   1,000    
Equity Method Investments     $ 13,000  
Syapse, Inc. [Member]        
Payments to Acquire Equity Method Investments $ 600 4,400    
Equity Method Investments   20,600    
Trice Medical [Member]        
Equity Method Investments   10,200    
Convertible Bridge Loan   700    
Clutch Holdings [Member]        
Payments to Acquire Equity Method Investments   200    
Equity Method Investments   16,700    
QuanticMind [Member]        
Equity Method Investments   13,500    
Convertible Bridge Loan   200    
WebLinc, Inc. [Member]        
Equity Method Investments   16,100    
Convertible Bridge Loan   $ 100