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

X

- 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

X

- Details

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

X

- Details

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