SUBSEQUENT EVENTS (Details Textual) (USD $)	12 Months Ended
Mar. 31, 2013
Gain On Sale Of Operating Partnerships	$ 13,000

Amount of gain on the sale of operating partnerships.

No definition available.

Name:	bctciii_GainOnSaleOfOperatingPartnerships
Namespace Prefix:	bctciii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration