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Note 5 - Agreement to Purchase and Sell Real Estate (Details Textual)	Nov. 30, 2017 USD ($) ft²	Jul. 13, 2017 USD ($) ft²
Commercial Real Estate in Sulphur, Louisiana [Member]
Area of Real Estate Property | ft²		44,000
Agreement to Purchase and Sell Real Estate, Amount | $		$ 2,725,000
Number of Buildings		3
Number of Land Parcels		2
Real Estate Agreement, Feasibility Period		90 days
Commercial Real Estate in Sulphur, Louisiana Amended [Member] | Scenario, Forecast [Member]
Area of Real Estate Property | ft²	29,600
Agreement to Purchase and Sell Real Estate, Amount | $	$ 2,055,000

X

- Definition

Represents Agreement to Purchase and Sell Real Estate ("Agreement") amount.

+ References

No definition available.

+ Details

Name:	ckx_AgreementToPurchaseAndSellRealEstateAmount
Namespace Prefix:	ckx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The number of buildings owned as real estate property.

+ References

No definition available.

+ Details

Name:	ckx_NumberOfBuildings
Namespace Prefix:	ckx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of parcels of land owned as real estate property.

+ References

No definition available.

+ Details

Name:	ckx_NumberOfLandParcels
Namespace Prefix:	ckx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The period which the Company has to determine whether the properties purchased in the real estate agreement are suitable for its intended use.

+ References

No definition available.

+ Details

Name:	ckx_RealEstateAgreementFeasibilityPeriod
Namespace Prefix:	ckx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ckx_CommercialRealEstateInSulphurLouisianaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ckx_CommercialRealEstateInSulphurLouisianaAmendedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: