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Note 11 - Postemployment Benefit Plans, Post-spin (Details Textual)		3 Months Ended
	Jun. 05, 2015 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Defined Benefit Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan, Number of Employees Covered	3
Defined Benefit Plan Salary Limitation Amount	$ 265,000
Defined Benefit Plan, Benefit Limitation Amount	210,000
Defined Benefit Plan, Accumulated Benefit Obligation	$ 4,100,000
401 (k) Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 600,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	5.00%
Defined Contribution Supplemental Executive Retirement Plan [Member] | Accrued Compensation and Related Benefits [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount		100,000
Defined Contribution Supplemental Executive Retirement Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Defined Contribution Plan, Tax Limitation Amount	$ 53,000
Accrued Compensation and Related Benefits [Member] | Chief Executive Officer [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability		2,000,000
Gain (Loss) on Deferred Compensation		200,000	$ 100,000
Deferred Compensation Liability, Current and Noncurrent		$ 17,700,000		$ 18,300,000

X

- Definition

The benefit limit applicable to tax-qualified plan for employees.

+ References

No definition available.

+ Details

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Namespace Prefix:	cabo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of employees eligible to participate in the defined benefit plan or plans described.

+ References

No definition available.

+ Details

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Namespace Prefix:	cabo_
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Balance Type:	na
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X

- Definition

The salary limit applicable to tax-qualified plans for employees.

+ References

No definition available.

+ Details

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Namespace Prefix:	cabo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of tax limitation under the defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	cabo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of gain (loss) on deferred compensation during the period.

+ References

No definition available.

+ Details

Name:	cabo_GainLossOnDeferredCompensation
Namespace Prefix:	cabo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accumulated Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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