| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS (Details)** | Jun. 30, 2014Number | Jun. 30, 2013Number |
|-------------------------------------------------------------|---------------------|---------------------|
| **Number Of Operating Partnerships [Line Items]**           |                |                |
| Number Of Operating Partnerships                            | 1                   | 6                   |
| Series One [Member]                                         |                |                |
| **Number Of Operating Partnerships [Line Items]**           |                |                |
| Number Of Operating Partnerships                            | 0                   | 0                   |
| Series Two [Member]                                         |                |                |
| **Number Of Operating Partnerships [Line Items]**           |                |                |
| Number Of Operating Partnerships                            | 0                   | 0                   |
| Series Three [Member]                                       |                |                |
| **Number Of Operating Partnerships [Line Items]**           |                |                |
| Number Of Operating Partnerships                            | 1                   | 6                   |
| Series Four [Member]                                        |                |                |
| **Number Of Operating Partnerships [Line Items]**           |                |                |
| Number Of Operating Partnerships                            | 0                   | 0                   |
| Series Five [Member]                                        |                |                |
| **Number Of Operating Partnerships [Line Items]**           |                |                |
| Number Of Operating Partnerships                            | 0                   | 0                   |
| Series Six [Member]                                         |                |                |
| **Number Of Operating Partnerships [Line Items]**           |                |                |
| Number Of Operating Partnerships                            | 0                   | 0                   |

| X                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of operating partnerships.
+ References
No definition available.
+ Details**Name:**bctc_NumberOfOperatingPartnerships**Namespace Prefix:**bctc_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**bctc_NumberOfOperatingPartnershipsLineItems**Namespace Prefix:**bctc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |