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Note 16 - Subsequent Event (Details Textual) $ in Millions | Oct. 08, 2021 USD ($)
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Subsequent Event [Member] | Cable America [Member] |
Asset Acquisition, Price of Acquisition, Expected | $ 113

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- Definition Purchase price of expected asset acquisition prior to consideration being transferred. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 15 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911878&loc=d3e8732-128492 + Details
Name: | us-gaap_AssetAcquisitionPriceOfAcquisitionExpected
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | us-gaap_AssetAcquisitionAxis=cabo_CableAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |