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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 ($)
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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: |