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Note 16 - Capital Stock - Capital Stock Issued and Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Capital Shares, Number (in shares) | 39,845,211 | 39,213,136
Capital Shares, Amount | $ 442,153 | $ 415,805
Subordinate Voting Shares [Member] |  |
Capital Shares, Number (in shares) | 38,519,517 | 37,887,442
Capital Shares, Amount | $ 441,780 | $ 415,432
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
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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: |
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Period Type: |

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