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Statements of Changes in Stockholders' Equity (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Balance $ 13,540,989us-gaap_StockholdersEquity $ 12,788,600us-gaap_StockholdersEquity $ 12,362,728us-gaap_StockholdersEquity
Net income 1,284,874us-gaap_NetIncomeLoss 969,771us-gaap_NetIncomeLoss  
Dividends Paid (543,899)us-gaap_Dividends (543,899)us-gaap_Dividends  
Dividend reversions 11,414ckx_DividendReversion    
Common Stock [Member]      
Balance 72,256us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
72,256us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
72,256us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Retained Earnings [Member]      
Balance 13,844,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
13,091,860us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
12,665,988us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net income 1,284,874us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
969,771us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Dividends Paid (543,899)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(543,899)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Dividend reversions 11,414ckx_DividendReversion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Treasury Stock [Member]      
Balance $ 375,516us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 375,516us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 375,516us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember