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Note 4 - Land Purchases and Sales - Land Sale (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) a	Dec. 31, 2022 USD ($) a	Sep. 30, 2022 USD ($) a	Jun. 30, 2022 a
Land Located in Jefferson Davis Parish, Louisiana [Member]
Acres (Acre) | a	80			1.81
Ownership	16.67%
Land sale | $	$ 149,992
Mineral Rights, Percent	0.00%			0.00%
Land Located in Calcasieu, Louisiana [Member]
Acres (Acre) | a			6.67
Ownership			16.67%
Land sale | $			$ 5,667
Mineral Rights, Percent			0.00%
Allen Located in Calcasieu Louisiana [Member]
Acres (Acre) | a		6.67
Ownership		16.67%
Land sale | $		$ 13,305
Mineral Rights, Percent		0.00%

X

- Definition

Represents the ownership percentage of land sold during the period.

+ References

No definition available.

+ Details

Name:	ckx_LandSoldDuringPeriodOwnershipPercentage
Namespace Prefix:	ckx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

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Namespace Prefix:	ckx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Area of land held.

+ References

No definition available.

+ Details

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

X

- 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

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: