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Note 19 - Capital Stock - Capital Stock Issued and Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Capital Shares, Number (in shares) | 40,189,436 | 39,845,211
Capital Shares, Amount | $ 457,993 | $ 442,153
Subordinate Voting Shares [Member] |  |
Capital Shares, Number (in shares) | 38,863,742 | 38,519,517
Capital Shares, Amount | $ 457,620 | $ 441,780
Multiple Voting Shares [Member] |  |
Capital Shares, Number (in shares) | 1,325,694 | 1,325,694
Capital Shares, Amount | $ 373 | $ 373

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- Definition Represents the value of the capital stock issued and outstanding. + References No definition available. + Details
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Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |