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Note 12 - Estimated Fair Value of Financial Instruments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Cash and cash equivalents	$ 5,225,594us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 4,529,051us-gaap_CashAndCashEquivalentsAtCarryingValue
Financial Assets	5,225,594us-gaap_CashAndCashEquivalentsAtCarryingValue	4,529,051us-gaap_CashAndCashEquivalentsAtCarryingValue
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	5,226,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	4,529,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Cash and cash equivalents	5,226,000us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	4,529,000us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Financial Assets	5,226,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	4,529,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Long Term [Member]
Certificates of deposit	240,000us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_LongTermMember
Long Term [Member] | Fair Value, Inputs, Level 1 [Member]
Certificates of deposit	240,000us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_LongTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Certificate of deposit – short term	240,000ckx_CertificateOfDepositFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = ckx_LongTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Short Term [Member]
Certificates of deposit	1,680,000us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_ShortTermMember	2,421,000us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_ShortTermMember
Short Term [Member] | Fair Value, Inputs, Level 1 [Member]
Certificates of deposit	1,680,000us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_ShortTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	2,421,000us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_ShortTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Certificate of deposit – short term	1,680,000ckx_CertificateOfDepositFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = ckx_ShortTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	2,421,000ckx_CertificateOfDepositFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = ckx_ShortTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	7,146,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_TotalCashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	6,950,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_TotalCashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Financial Assets	7,146,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_TotalCashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	6,950,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = ckx_TotalCashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Financial Assets	$ 7,146,000us-gaap_DepositsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = ckx_TotalCashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	$ 6,950,000us-gaap_DepositsFairValueDisclosure / us-gaap_CashAndCashEquivalentsAxis = ckx_TotalCashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Glossary Cash Equivalents



-URI http://asc.fasb.org/extlink&oid=6507016







Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



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Reference 3: http://www.xbrl.org/2003/role/presentationRef



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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

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