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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%

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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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.

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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.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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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.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The amount of goodwill that is non-tax deductible in a business acquisition.

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No definition available.

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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.

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