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Note 4 - Land Purchases and Sales - Land Sale (Details)	3 Months Ended				12 Months Ended
	Dec. 31, 2025 USD ($) a	Sep. 30, 2025 USD ($) a	Jun. 30, 2025 USD ($) a	Jun. 30, 2024 USD ($) a	Dec. 31, 2025 a
Land Located in Calcasieu, Louisiana [Member]
Area of land (Acre) | a		25	25	25
Land sold, ownership		100.00%	100.00%	100.00%
Land sale | $		$ 141,105	$ 141,008	$ 140,582
Mineral rights, percent		0.00%	0.00%		0.00%
Land Located in Calcasieu, Louisiana 2 [Member]
Area of land (Acre) | a			53
Land sold, ownership			100.00%
Land sale | $			$ 217,115
Mineral rights, percent			0.00%
Land Located in Various Locations [Member]
Area of land (Acre) | a	6,548				6,548
Land sold, ownership	100.00%
Land sale | $	$ 8,618,022
Mineral rights, percent	0.00%

X

- Definition

Represents the ownership percentage of land sold during the period.

+ 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

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_
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X

- Definition

Area of land held.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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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

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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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X

- Details

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Namespace Prefix:
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X

- Details

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