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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

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479405/805-10-25-23 + Details
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