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Note 10 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 20, 2023
Mar. 01, 2022
Feb. 11, 2022
Dec. 23, 2021
Nov. 02, 2021
Sep. 01, 2021
Jun. 17, 2021
Mar. 02, 2021
Feb. 28, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2024
Feb. 01, 2023
Feb. 01, 2022
Goodwill, Acquired During Period                   $ 55,900 $ 284,400 [1]        
Goodwill, Ending Balance                   1,760,800 1,676,000 $ 2,047,600      
Payments to Acquire Businesses, Net of Cash Acquired, Total                   83,300 448,900 289,800      
Escrow Release                   0 12,800        
Current Portion of Escrow                   3,900 0        
Business Combination, Contingent Consideration, Liability, Current                   10,000 29,900        
Business Combination, Contingent Consideration, Liability, Noncurrent                   2,100 0        
Krug Sachverständigen GmbH [Member]                              
Business Combination, Consideration Transferred $ 43,300                            
Business Combination, Consideration Transferred, Indemnity Escrows $ 3,800                            
Goodwill, Ending Balance                   33,100          
Payments to Acquire Businesses, Net of Cash Acquired, Total                   43,300          
Mavera [Member]                              
Business Combination, Consideration Transferred                 $ 28,300            
Business Acquisition, Percentage of Voting Interests Acquired                             100.00%
Business Combination, Indemnification Assets, Amount as of Acquisition Date                           $ 4,200  
Goodwill, Acquired During Period                   55,900          
The 2023 Acquisitions [Member] | Selling, General and Administrative Expenses [Member]                              
Business Combination, Acquisition Related Costs                   $ 2,500          
Opta Information Intelligence Corp. [Member]                              
Business Combination, Consideration Transferred   $ 217,500                          
Business Acquisition, Percentage of Voting Interests Acquired   100.00%                          
Business Combination, Indemnification Assets, Amount as of Acquisition Date   $ 800                          
Goodwill, Ending Balance                     141,100        
Payments to Acquire Businesses, Net of Cash Acquired, Total                     217,500        
Infutor Data Solutions, LLC [Member]                              
Business Combination, Consideration Transferred     $ 220,700                        
Business Acquisition, Percentage of Voting Interests Acquired     100.00%                        
Business Combination, Working Capital Escrow     $ 1,500                        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 25,000                        
Goodwill, Ending Balance                     140,300        
Payments to Acquire Businesses, Net of Cash Acquired, Total                     220,700        
The 2022 Acquisitions [Member]                              
Goodwill, Ending Balance                     284,400        
Business Acquisition, Goodwill Non-tax Deductible, Amount                     144,500        
The 2022 Acquisitions [Member] | Selling, General and Administrative Expenses [Member]                              
Business Combination, Acquisition Related Costs                     $ 1,800        
ACTINEO [Member]                              
Business Acquisition, Percentage of Voting Interests Acquired       96.70%                      
Goodwill, Ending Balance                       121,900      
Payments to Acquire Businesses, Net of Cash Acquired, Total       $ 148,900               148,900      
Data Driven Safety, LLC [Member]                              
Business Acquisition, Percentage of Voting Interests Acquired         100.00%                    
Goodwill, Ending Balance                       74,100      
Payments to Acquire Businesses, Net of Cash Acquired, Total         $ 93,500             93,500      
Escrow Deposit         $ 2,000                    
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%    
The 2021 Acquisitions [Member]                              
Goodwill, Ending Balance                       235,600      
Business Acquisition, Goodwill Non-tax Deductible, Amount                       161,300      
Payments to Acquire Businesses, Net of Cash Acquired, Total                       276,900      
The 2021 Acquisitions [Member] | Selling, General and Administrative Expenses [Member]                              
Business Combination, Acquisition Related Costs                       $ 2,800      
[1] This adjustment relates to a segment reclassification; refer to Note 19. Segment Reporting