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Note 15 - Warehouse Credit Facilities (Details Textual) - Warehouse Credit Facilities [Member] - USD ($) $ in Thousands | Oct. 20, 2021 | Jan. 15, 2021 | Jan. 11, 2021 | Dec. 31, 2020
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Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 400,000
Forecast [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 125,000 |  |  |
Subsequent Event [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 250,000 | $ 175,000 |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=cigi_WarehouseCreditFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |