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v3.24.1

Note 1 - Nature of Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Property, Plant and Equipment, Useful Life [Table Text Block] |
Furniture and equipment (years) |  | 5 | - | 7 |
Land improvements (years) |  |  | 15 |  |

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- Definition Tabular disclosure of the useful life of physical assets used in the normal conduct of business and not intended for resale. + References No definition available. + Details
Name: | ckx_PropertyPlantAndEquipmentUsefulLifeTableTextBlock
Namespace Prefix: | ckx_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration