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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% |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 440 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6491277&loc=d3e6429-115629 + Details
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- Definition The designation of funds expected to be paid during the twelve-month period following the balance sheet date which is furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References No definition available. + Details
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