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Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 5,225,594us-gaap_CashAndCashEquivalentsAtCarryingValue $ 4,529,051us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable 146,413us-gaap_AccountsReceivableNetCurrent 228,014us-gaap_AccountsReceivableNetCurrent
Prepaid expense and other assets 50,085us-gaap_PrepaidExpenseAndOtherAssets 29,482us-gaap_PrepaidExpenseAndOtherAssets
Total current assets 7,102,092us-gaap_AssetsCurrent 7,207,547us-gaap_AssetsCurrent
Non-current Assets    
Building and equipment less accumulated depreciation of $90,432 and $84,191, respectively   6,241us-gaap_PropertyPlantAndEquipmentNet
Land 4,957,135us-gaap_Land 4,531,179us-gaap_Land
Total assets 13,826,652us-gaap_Assets 13,046,606us-gaap_Assets
Current Liabilities:    
Trade payables and accrued expenses 61,237us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 76,188us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Total current liabilities 61,237us-gaap_LiabilitiesCurrent 76,188us-gaap_LiabilitiesCurrent
Deferred income tax payable 224,426us-gaap_DeferredTaxLiabilitiesNoncurrent 181,818us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 285,663us-gaap_Liabilities 258,006us-gaap_Liabilities
Stockholders’ Equity:    
Common stock, no par value: 3,000,000 shares authorized; 2,100,000 shares issued 72,256us-gaap_CommonStockValue 72,256us-gaap_CommonStockValue
Retained earnings 13,844,249us-gaap_RetainedEarningsAccumulatedDeficit 13,091,860us-gaap_RetainedEarningsAccumulatedDeficit
Less cost of treasury stock (157,505 shares) (375,516)us-gaap_TreasuryStockValue (375,516)us-gaap_TreasuryStockValue
Total stockholders’ equity 13,540,989us-gaap_StockholdersEquity 12,788,600us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity 13,826,652us-gaap_LiabilitiesAndStockholdersEquity 13,046,606us-gaap_LiabilitiesAndStockholdersEquity
Timber Properties [Member]    
Non-current Assets    
Building and equipment less accumulated depreciation of $90,432 and $84,191, respectively 1,527,425us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TimberPropertiesMember		 1,301,639us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TimberPropertiesMember
Building and Equipment [Member]    
Non-current Assets    
Building and equipment less accumulated depreciation of $90,432 and $84,191, respectively   6,241us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ckx_BuildingAndEquipmentMember
Long Term [Member]    
Current Assets:    
Certificates of deposit 240,000us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= ckx_LongTermMember		  
Non-current Assets    
Certificates of deposit 240,000us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= ckx_LongTermMember		  
Short Term [Member]    
Current Assets:    
Certificates of deposit 1,680,000us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= ckx_ShortTermMember		 2,421,000us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= ckx_ShortTermMember
Non-current Assets    
Certificates of deposit $ 1,680,000us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= ckx_ShortTermMember		 $ 2,421,000us-gaap_CertificatesOfDepositAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= ckx_ShortTermMember