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Note 21 - Other Supplemental Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Other Supplement Information [Table Text Block] |
|  | 2019 |  |  | 2018 |
Cash payments made during the year |  |  |  |  |  |  |  |
Income tax, net of refunds |  | $ | 73,031 |  |  | $ | 42,153 |
Interest |  |  | 27,685 |  |  |  | 20,404 |
Non-cash financing activities |  |  |  |  |  |  |  |
Increases (Decreases) in capital lease obligations |  | $ | (616 | ) |  | $ | (522 | )
Dividends declared but not paid |  |  | 1,992 |  |  |  | 1,961 |
Other expenses |  |  |  |  |  |  |  |
Rent expense |  | $ | 76,893 |  |  | $ | 74,183 |

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- Definition The tabular disclosure of the schedule of other supplement information. + References No definition available. + Details
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Namespace Prefix: | cigi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration