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Organization (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 30, 2011
Dec. 31, 2013
Dec. 31, 2011
Mar. 31, 2014
Sep. 30, 2014
Oct. 28, 2011
Oct. 27, 2011
Jun. 29, 2011
Oct. 24, 1994
ORGANIZATION [Abstract]                    
Common Stock, Shares, Issued         3,697,836us-gaap_CommonStockSharesIssued 3,698,031us-gaap_CommonStockSharesIssued       2,314,375us-gaap_CommonStockSharesIssued
Common Stock, Par or Stated Value Per Share         $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare       $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Proceeds from Issuance of Convertible Preferred Stock   $ 55,000,000us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock                
Preferred Stock, Shares Issued         45,118us-gaap_PreferredStockSharesIssued 45,118us-gaap_PreferredStockSharesIssued     55,000us-gaap_PreferredStockSharesIssued  
Proceeds from Issuance of Preferred Stock and Preference Stock   51,400,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock                
Proceeds from Contributions from Parent   37,000,000us-gaap_ProceedsFromContributionsFromParent   7,000,000us-gaap_ProceedsFromContributionsFromParent            
Stockholders' Equity, Reverse Stock Split       1-for-15            
Common Stock, Shares, Outstanding         3,695,892us-gaap_CommonStockSharesOutstanding 3,696,087us-gaap_CommonStockSharesOutstanding   2,492,415us-gaap_CommonStockSharesOutstanding    
Stock Issued During Period, Shares, Reverse Stock Splits       166,161us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits            
Stock Issued During Period, Shares, Other       2,321,286us-gaap_StockIssuedDuringPeriodSharesOther            
Conversion of Stock, Shares Converted       1,208,039us-gaap_ConversionOfStockSharesConverted1            
Convertible Preferred Stock, Shares Issued upon Conversion             45,118us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion      
Pension plan adjustment $ 432,000carv_Pensionplanadjustment   $ 716,000carv_Pensionplanadjustment   $ 716,000carv_Pensionplanadjustment