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Note 4 - Acquisitions (Details Textual) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2022
Number of Businesses Acquired | 12 |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 483,159,000 | $ 2,678,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 714,775,000 |  |  |  |
Investment Management Contracts [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 321,140,000 |  |  |  |
Customer Lists and Relationships [Member] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 355,482,000 |  |  |  |
Basalt Infrastructure Partners LLP [Member] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 75.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 165,000,000 |  |  |  |
Rockwood Capital, LLC [Member] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 65.00% |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 108,100,000 |  |  |  |
Versus Capital [Member] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 75.00% |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 218,800,000 |  |  |  |
Acquisitions after December 31, 2008 [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total | 91,229,000 | 154,671,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low | 361,606 |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 421,971 |  |  |  |
Contingent Consideration Paid | 125,514,000 | 23,293,000 |  |  |
Acquisitions after December 31, 2008 [Member] | Contingent Consideration, Compensation Element [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total | $ 61,870,000 | $ 13,607,000 |  |  |
Americas [Member] |  |  |  |  |
Number of Businesses Acquired | 2 | 2 |  |  |

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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 https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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