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Related Parties (Details) (USD $)
Dec. 31, 2014
Related Party Transaction [Line Items]  
Amounts paid $ 2,288,284us-gaap_RelatedPartyTransactionDueFromToRelatedParty
2010 [Member]  
Related Party Transaction [Line Items]  
Amounts paid 150,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= crvn_AmountsPaidInTwoThousandTenMember
2011 [Member]  
Related Party Transaction [Line Items]  
Amounts paid 463,738us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= crvn_AmountsPaidInTwoThousandElevenMember
2012 [Member]  
Related Party Transaction [Line Items]  
Amounts paid 647,651us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= crvn_AmountsPaidInTwoThousandTwelveMember
2013 [Member]  
Related Party Transaction [Line Items]  
Amounts paid 312,945us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= crvn_AmountsPaidInThroughTwoThousandThirteenMember
2014 [Member]  
Related Party Transaction [Line Items]  
Amounts paid $ 713,950us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= crvn_AmountsPaidInTwoThousandFourteenMember