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Note 18 - Capital Stock (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2021 $ / shares | Dec. 31, 2020 $ / shares
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.20 | $ 0.10
Subordinate Voting Shares [Member] |  |
Number of Votes for Subordinate Voting Shares | 1 |
Multiple Voting Shares [Member] |  |
Number of Votes for Multiple Voting Shares | 20 |

X
- Definition Represents the number of votes for multiple voting shares. + References No definition available. + Details
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Namespace Prefix: | cigi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of votes for the subordinate voting shares. + References No definition available. + Details
Name: | cigi_NumberOfVotesForSubordinateVotingShares
Namespace Prefix: | cigi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=cigi_MultipleVotingSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |