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Note 3 - Impact of Recently Issued Accounting Standards (Details Textual) - Cumulative Effect, Period of Adoption, Adjustment [Member] - Accounting Standards Update 2016-13 [Member] $ in Thousands	Jan. 01, 2020 USD ($)
Retained Earnings (Accumulated Deficit), Net of Taxes	$ 3,629
Retained Earnings (Accumulated Deficit), Tax Effect	$ 805

X

- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit, net of taxes.

+ References

No definition available.

+ Details

Name:	cigi_RetainedEarningsAccumulatedDeficitNetOfTaxes
Namespace Prefix:	cigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of tax effect of the reporting entity's undistributed earnings or deficit.

+ References

No definition available.

+ Details

Name:	cigi_RetainedEarningsAccumulatedDeficitTaxEffect
Namespace Prefix:	cigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: