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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

X

- Definition

The contingent consideration paid.

+ References

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- Definition

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

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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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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X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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- Definition

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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The number of businesses acquired by the entity during the period.

+ References

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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