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Note 6 - Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Goodwill, Ending Balance $ 4,135,600   $ 4,108,100
Net of cash acquired from acquisitions 3,800 $ 0  
Payments to Acquire Businesses, Net of Cash Acquired, Total 13,700 $ (0)  
The 2021 Acquisitions [Member]      
Cash and cash equivalents 3,800    
Accounts receivable 1,100    
Other current assets 800    
Fixed assets 100    
Intangible assets 11,400    
Goodwill, Ending Balance 20,900    
Total assets acquired 38,100    
Current liabilities 1,000    
Deferred revenues 1,400    
Deferred income tax, net 2,200    
Total liabilities assumed 4,600    
Net assets acquired 33,500    
Less: Noncontrolling interest 16,000    
Net of cash acquired from acquisitions 3,800    
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 13,700