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Stock-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Feb. 25, 2010
Jun. 14, 2012
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based compensation expense $ 75,000us-gaap_AllocatedShareBasedCompensationExpense $ 60,000us-gaap_AllocatedShareBasedCompensationExpense      
Exercised, SARs 0cphc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod        
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, vesting period     42 months    
Share-based compensation, expiration period 10 years   10 years    
Period options become exercisable 4 years        
Employee Deferred Stock Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, other than options granted 1,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cphc_EmployeeDeferredStockAwardMember
       
Share-based compensation, vesting period 4 years        
Share-based compensation, nonvested number of shares 35,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cphc_EmployeeDeferredStockAwardMember
      34,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cphc_EmployeeDeferredStockAwardMember
Share-based Compensation, nonvested, weighted average grant date fair value $ 10.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cphc_EmployeeDeferredStockAwardMember
      $ 10.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cphc_EmployeeDeferredStockAwardMember
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock, percentage that will vest 100.00%cphc_RestrictedStockPercentageThatWillVest
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Share-based compensation, vesting period 1 year        
Share-based compensation, nonvested number of shares 13,040us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Share-based Compensation, nonvested, weighted average grant date fair value $ 10.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based compensation expense 83,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
91,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
     
Share-based compensation, other than options granted        165,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
 
Share-based compensation, nonvested number of shares 99,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
      115,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Share-based Compensation, nonvested, weighted average grant date fair value $ 5.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
      $ 4.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Benefit from appreciation in the value of common stock, per share       $ 14.30cphc_BenefitFromAppreciationInValueOfCommonStockPerShare
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
 
Number of shares of stock each right represents       1cphc_NumberOfSharesOfStockEachRightRepresents
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
 
Percentage of the Rights vested       10.00%cphc_PercentageOfRightsVested
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
 
Number of the Rights vested 66,000cphc_NumberOfRightsVested
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
    16,500cphc_NumberOfRightsVested
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
 
Number of remaining Rights vest per year       16,500cphc_NumberOfRemainingRightsVestPerYear
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
 
Total liability of SARs vested $ 582,597us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember