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Note 4 - Acquisitions (Details Textual) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 01, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | May 31, 2020 USD ($)
Business Combination, Consideration Transferred, Total |  | $ 62,682 | $ 229,325 |
Servicing Asset at Fair Value, Amount, Ending Balance |  | 126,162 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  | $ 2,678 | 61,416 |
Bergman Associates [Member] |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |
Business Combination, Consideration Transferred, Total | $ 56,932 |  |  |
Miami, Florida Business [Member] |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |  |
Colliers Mortgage [Member] |  |  |  |
Business Combination, Consideration Transferred, Total |  |  | $ 143,454 |
Servicing Asset at Fair Value, Amount, Ending Balance |  |  |  | $ 99,900
Colliers Mortgage [Member] | Americas [Member] |  |  |  |
Number of Businesses Acquired |  |  | 2 |
Acquisitions after December 31, 2008 [Member] |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  | $ 154,671 | $ 115,643 |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low |  | 177,646 |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | 191,647 |  |
Contingent Consideration Paid |  | 23,293 | 29,405 |
Acquisitions after December 31, 2008 [Member] | Contingent Consideration, Compensation Element [Member] |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  | $ 5,070 | $ 17,646 |

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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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