Introduction (Details Textual)	9 Months Ended
Dec. 31, 2012
Limited Partners Cumulative Earnings Sharing Percentage	99.00%
General Partners Cumulative Earnings Sharing Percentage	1.00%
Net Proceeds From Sale Refinancing, Limited Partners, Sharing Percentage	95.00%
Net Proceeds From Sale Refinancing, General Partners, Sharing Percentage	5.00%

Percentage of cumulative earnings allocated to the limited partners based on the sharing of income or losses between general and limited partners as specified in the partnership agreement.

No definition available.

Name:	bftcpa_LimitedPartnersCumulativeEarningsSharingPercentage
Namespace Prefix:	bftcpa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration