| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS (Details Textual) (USD $)** | 3 Months Ended |
|-----------------------------------------------------------------------------|----------------|
||
| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS [Line Items]**              |           |   |
| Income Loss Not Recognized Under Equity Method Accounting                   | $ 13,003       | $ 45,799 |
| Series One [Member]                                                         |           |   |
| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS [Line Items]**              |           |   |
| Income Loss Not Recognized Under Equity Method Accounting                   | 0              | 0 |
| Series Two [Member]                                                         |           |   |
| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS [Line Items]**              |           |   |
| Income Loss Not Recognized Under Equity Method Accounting                   | 0              | 0 |
| Series Three [Member]                                                       |           |   |
| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS [Line Items]**              |           |   |
| Income Loss Not Recognized Under Equity Method Accounting                   | 13,003         | 45,799 |
| Series Four [Member]                                                        |           |   |
| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS [Line Items]**              |           |   |
| Income Loss Not Recognized Under Equity Method Accounting                   | 0              | 0 |
| Series Five [Member]                                                        |           |   |
| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS [Line Items]**              |           |   |
| Income Loss Not Recognized Under Equity Method Accounting                   | 0              | 0 |
| Series Six [Member]                                                         |           |   |
| **INVESTMENTS IN OPERATING LIMITED PARTNERSHIPS [Line Items]**              |           |   |
| Income Loss Not Recognized Under Equity Method Accounting                   | $ 0            | $ 0 |

| X                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income loss not recognized under equity method accounting.
+ References
No definition available.
+ Details**Name:**bctc_IncomeLossNotRecognizedUnderEquityMethodAccounting**Namespace Prefix:**bctc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**bctc_InvestmentsInOperatingLimitedPartnershipsLineItems**Namespace Prefix:**bctc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |