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RELATED PARTY TRANSACTIONS (Details Textual)	6 Months Ended
RELATED PARTY TRANSACTIONS (Details Textual)	Sep. 30, 2012
Percentage Of Annual Management Fee	0.50%

X

- Definition

The percentage of annual management fee.

+ References

No definition available.

+ Details

Name:	bctciv_PercentageOfAnnualManagementFee
Namespace Prefix:	bctciv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration