XML 66 R94.htm IDEA: XBRL DOCUMENT v3.2.0.727

Fair Value Measurements Text Tag (Details)	12 Months Ended
	Mar. 31, 2015
FAIR VALUE MEASUREMENTS [Abstract]
Percent of Total Assets Level 3	0.00%
Transfers between level 1 and level 2	0

X

- Definition

FAIR VALUE MEASUREMENTS [Abstract]

+ References

No definition available.

+ Details

Name:	carv_FairValueMeasurementsAbstract
Namespace Prefix:	carv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percent of Total Assets Level 3

+ References

No definition available.

+ Details

Name:	carv_PercentOfTotalAssetsLevel3
Namespace Prefix:	carv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Transfers between level 1 and level 2

+ References

No definition available.

+ Details

Name:	carv_Transfersbetweenlevel1andlevel2
Namespace Prefix:	carv_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration