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Note 6 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 02, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2024
Dec. 31, 2020
Payments to Acquire Businesses, Net of Cash Acquired, Total   $ 13,700 $ (0)    
Goodwill, Ending Balance   4,135,600     $ 4,108,100
Business Combination, Acquisition Related Costs   500 $ 0    
Current Portion of Escrow   19,100     1,700
Escrow Deposit   1,300     18,500
Business Combination, Contingent Consideration, Liability, Current   300     600
Business Combination, Contingent Consideration, Liability, Noncurrent   0     $ 200
The 2021 Acquisitions [Member]          
Business Combination, Consideration Transferred, Total   13,700      
Payments to Acquire Businesses, Net of Cash Acquired, Total   13,700      
Goodwill, Ending Balance   $ 20,900      
Whitespace Software Limited [Member]          
Business Acquisition, Percentage of Voting Interests Acquired 51.00%        
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 12,800        
Goodwill, Ending Balance 20,900        
Business Acquisition, Goodwill Non-tax Deductible, Amount $ 20,000        
Whitespace Software Limited [Member] | Forecast [Member]          
Business Acquisition, Percentage of Voting Interests Acquired       49.00%