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Note 20 - Net Earnings (Loss) Per Common Share (Details Textual) | Jul. 20, 2023 shares
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The 2023/2024 NCIB [Member] |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | 4,000,000

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=cigi_The20232024NCIBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |