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Note 6 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 01, 2021
Jun. 17, 2021
Mar. 02, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2024
Dec. 31, 2020
Payments to Acquire Businesses, Net of Cash Acquired, Total       $ 17,900 $ 151,900 $ 49,400 $ 151,900    
Escrow Deposit       4,600   4,600     $ 18,500
Goodwill, Ending Balance       4,129,500   4,129,500     4,108,100
Business Combination, Acquisition Related Costs       100 $ 500 900 $ 500    
Current Portion of Escrow       17,700   17,700     1,700
Business Combination, Contingent Consideration, Liability, Current       500   500     600
Business Combination, Contingent Consideration, Liability, Noncurrent       0   0     $ 200
The 2021 Acquisitions [Member]                  
Business Combination, Consideration Transferred, Total           56,600      
Payments to Acquire Businesses, Net of Cash Acquired, Total           56,600      
Goodwill, Ending Balance       61,000   61,000      
Business Acquisition, Goodwill Non-tax Deductible, Amount       $ 60,100   $ 60,100      
Ignite Acquisition [Member]                  
Business Acquisition, Percentage of Voting Interests Acquired 100.00%                
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 13,800                
RoskillAcquisitionMember                  
Business Acquisition, Percentage of Voting Interests Acquired   100.00%              
Payments to Acquire Businesses, Net of Cash Acquired, Total   $ 22,100              
Escrow Deposit   $ 4,800              
Whitespace Software Limited [Member]                  
Business Acquisition, Percentage of Voting Interests Acquired     51.00%            
Payments to Acquire Businesses, Net of Cash Acquired, Total     $ 16,800            
Whitespace Software Limited [Member] | Forecast [Member]                  
Business Acquisition, Percentage of Voting Interests Acquired               49.00%