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Note 7 - Related Party Transactions (Details Textual) - USD ($)		1 Months Ended	3 Months Ended			6 Months Ended
	Apr. 17, 2017	Aug. 31, 2018	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2018	Jun. 30, 2020	Jun. 30, 2019
Surface Leases, Related Parties [Member]
Operating Leases, Income Statement, Lease Revenue, Total			$ 9,583	$ 9,583		$ 19,166	$ 19,166
Stream Wetlands Services [Member] | Exclusive Right to Evaluate and Market Lands For Beneficial Purposes to Compensate for Impact [Member]
Related Party Transaction, Amounts of Transaction	$ 38,333				$ 38,333
Stockwell [Member] | Rent Expenses for Office Space and Associated Services [Member]
Operating Lease Monthly Rent		$ 750
Stockwell [Member] | Administrative Assistant and Miscellaneous Offices Supplies, Monthly Expense [Member]
Operating Lease Monthly Rent		$ 2,000
Related Party Transaction, Expenses from Transactions with Related Party						16,713
Related Party Rent Expense						$ 4,500

X

- Definition

Amount of the monthly rent required for operating lease.

+ References

No definition available.

+ Details

Name:	ckx_OperatingLeaseMonthlyRent
Namespace Prefix:	ckx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Rent expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

Name:	ckx_RelatedPartyRentExpense
Namespace Prefix:	ckx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121549951&loc=d3e39896-112707

+ Details

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

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

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Balance Type:	debit
Period Type:	duration

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ckx_StreamWetlandsServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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