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Fair Value Measurements Text Tag (Details) (USD $)	Jun. 30, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	$ 0.001

X

- Definition

Level 3 assets percent of total assets

+ References

No definition available.

+ Details

Name:	carv_Level3AssetsPercentOfTotalAssets
Namespace Prefix:	carv_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration