| **RELATED PARTY TRANSACTIONS (Tables)**              | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Related Party Transactions Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Schedule Of Gross Management Fee [Table Text Block]  | The partnership management fees accrued for the three months ended June 30, 2014 and 2013 are as follows:     2014 2013Series 1$       -$       -Series 2--Series 31,3327,230Series 4--Series 5--Series 6       -       - $   1,332$   7,230                                                              |
| Schedule Of Management Fees Paid [Table Text Block]  | The partnership management fees paid for the three months ended June 30, 2014 and 2013 are as follows:     2014 2013Series 1$       -$       -Series 2--Series 3--Series 4--Series 5--Series 6        -        - $       -$       - |

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| - Definition
Tabular disclosure for gross management fee.
+ References
No definition available.
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| - Definition
Tabular disclosure for management fees paid.
+ References
No definition available.
+ Details**Name:**bctc_ScheduleOfManagementFeesPaidTableTextBlock**Namespace Prefix:**bctc_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
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| - Details**Name:**us-gaap_RelatedPartyTransactionsAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |