Annual report pursuant to Section 13 and 15(d)

Fair Value of Other Securities (Details Textual)

v2.4.1.9
Fair Value of Other Securities (Details Textual) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Oct. 03, 2014
Nov. 30, 2012
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Proceeds from Divestiture of Businesses $ 13,600,000us-gaap_ProceedsFromDivestitureOfBusinesses    
Proceeds from Divestiture of Business Held in Escrow 2,900,000corr_ProceedsfromDivestitureofBusinessHeldinEscrow    
Divestiture of Business, Proceeds Held in Escrow Discount     370,000corr_DivestitureofBusinessProceedsHeldinEscrowDiscount
Proceeds from Divestiture of Business Held in Escrow, Net     2,400,000corr_ProceedsfromDivestitureofBusinessHeldinEscrowNet
Proceeds from Sale of Available-for-sale Securities, Equity     13,200,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Transfers between levels   $ 0corr_FairValueTransfersBetweenLevelsTransfersAmount $ 0corr_FairValueTransfersBetweenLevelsTransfersAmount
Escrow Receivable Release Percentage after Time Expiration     50.00%corr_EscrowReceivableReleasePercentageafterTimeExpiration
Lightfoot Capital Partners LP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Ownership Percentage     6.70%us-gaap_EquityMethodInvestmentOwnershipPercentage
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= corr_LightfootCapitalPartnersLpMember