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Note 1 - Nature of Business and Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2014
Period Subject To Examination Federal And State Income Tax Returns	3 years

X

- Definition

The period that is subject to examination for federal and state income tax returns.

+ References

No definition available.

+ Details

Name:	ckx_PeriodSubjectToExaminationFederalAndStateIncomeTaxReturns
Namespace Prefix:	ckx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration