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Note 4 - Land Purchases and Sales - Land Purchase (Details) - Land Located in Jefferson Davis Parish, Louisiana [Member] | 3 Months Ended
--- | ---
Mar. 31, 2023 a | Jun. 30, 2022 USD ($) a
Acres (Acre) | a | 80 | 1.81
Land purchase, ownership |  | 16.67%
Land purchase | $ |  | $ 564
Mineral Rights, Percent | 0.00% | 0.00%

X
- Definition Represents the ownership percentage of land acquired during the period. + References No definition available. + Details
Name: | ckx_LandAcquiredDuringPeriodOwnershipPercentage
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
Name: | ckx_MineralRightsConveyedPercentage
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 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

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ckx_LandLocatedInJeffersonDavisParishLouisianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |