v2.4.0.6

Investments in Local Limited Partnerships (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Cumulative Unrecognized Equity Losses In Local Limited Partnerships					$ 1,546,000
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest			99.00%	99.00%
Net Equity Income Loss On Local Limited Partnership Investments			(92,566)	61,990
Unrecognized Equity Losses On Local Limited Partnership Investments			291,561	183,758
Unrecognized Equity Losses Included In Recognized Loss			24,519	48,245
Funds Investment Value At Time Of Sale			2,009
Loss on disposition of investments in Local Limited Partnerships	$ 0	$ 0	$ (2,009)	$ 0

- Definition

Represents the value of cumulative unrecognized equity losses in local limited partnerships as of balance sheet date.

+ References

No definition available.

+ Details

Name:	bftcpa_CumulativeUnrecognizedEquityLossesInLocalLimitedPartnerships
Namespace Prefix:	bftcpa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This represents the value of investments at the time of sale.

+ References

No definition available.

+ Details

Name:	bftcpa_FundsInvestmentValueAtTimeOfSale
Namespace Prefix:	bftcpa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the net income/loss is from Local Limited Partnerships to the Fund.

+ References

No definition available.

+ Details

Name:	bftcpa_NetEquityIncomeLossOnLocalLimitedPartnershipInvestments
Namespace Prefix:	bftcpa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents the amount of unrecognized loss included in recognized losses on local limited partnership during the period .

+ References

No definition available.

+ Details

Name:	bftcpa_UnrecognizedEquityLossesIncludedInRecognizedLoss
Namespace Prefix:	bftcpa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents unrecognized loss from local limited liability partnership investments due to cumulative distributions and losses exceeds the total investments.

+ References

No definition available.

+ Details

Name:	bftcpa_UnrecognizedEquityLossesOnLocalLimitedPartnershipInvestments
Namespace Prefix:	bftcpa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents the amount of gain (loss) arising from the disposal of an equity method investment.

+ References

No definition available.

+ Details

Name:	us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 22

-Article 12

+ Details

Name:	us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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