Represents the ownership percentage of land acquired during the period.

No definition available.

Name:	ckx_LandAcquiredDuringPeriodOwnershipPercentage
Namespace Prefix:	ckx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the ownership percentage of land sold during the period.

+ References

No definition available.

+ Details

Name:	ckx_LandSoldDuringPeriodOwnershipPercentage
Namespace Prefix:	ckx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The conveyed percentage of mineral rights, or rights to extract a mineral from the earth or to receive payment in the form of a royalty for the extraction of minerals, net of amortization.

+ References

No definition available.

+ Details

Name:	ckx_MineralRightsConveyedPercentage
Namespace Prefix:	ckx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

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

- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentDisposals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_TimberPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=ckx_TimberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Note 4 - Land Purchases and Sales - Company Interest in Acres, Land, Timber, and Mineral Rights (Details)	3 Months Ended
	Dec. 31, 2017 USD ($) a	Sep. 30, 2017 USD ($) a	Mar. 31, 2017 USD ($) a	Sep. 30, 2016 USD ($) a	Jun. 30, 2016 USD ($) a	Mar. 31, 2016 USD ($) a
Land Located in Beauregard Parish, Louisiana [Member]
Acres (Acre) \| a					129	40
Land Acquired, Ownership Percentage					100.00%	100.00%
Mineral Rights, Percent					50.00%	0.00%
Land Located in Beauregard Parish, Louisiana [Member] \| Land [Member]
Purchased Property					$ 198,874	$ 59,638
Land Located in Beauregard Parish, Louisiana [Member] \| Timber Properties [Member]
Purchased Property					$ 34,200	$ 10,000
Land Located in Calcasieu, Louisiana [Member]
Acres (Acre) \| a	0.4	2	1	880
Land Acquired, Ownership Percentage				100.00%
Mineral Rights, Percent	0.00%	0.00%	0.00%	50.00%
Land Sold, Ownership Percentage	100.00%	16.66%	100.00%
Land Located in Calcasieu, Louisiana [Member] \| Land [Member]
Purchased Property				$ 1,532,092
Sold property	$ 3,914	$ 888	$ 3,390
Land Located in Calcasieu, Louisiana [Member] \| Timber Properties [Member]
Purchased Property				$ 408,000
Sold property
Land Located in Calcasieu, Louisiana [Member] \| Timber [Member]
Sold property
Second Land Located in Calcasieu Louisiana [Member]
Acres (Acre) \| a		44		80
Land Acquired, Ownership Percentage				100.00%
Mineral Rights, Percent		50.00%		100.00%
Land Sold, Ownership Percentage		16.66%
Second Land Located in Calcasieu Louisiana [Member] \| Land [Member]
Purchased Property				$ 74,895
Sold property		$ 31,196
Second Land Located in Calcasieu Louisiana [Member] \| Timber Properties [Member]
Purchased Property				$ 58,000
Sold property