| **INCOME TAXES**                                           | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Income Tax Disclosure [Abstract]**                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Income Tax Relating To Partnership Disclosure [Text Block] | NOTE F - INCOME TAXES The Partnership has elected to be treated as a pass-through entity for income tax purposes and, as such, is not subject to income taxes. Rather, all items of taxable income, deductions and tax credits are passed through to and are reported by its owners on their respective income tax returns. The Partnership’s federal tax status as a pass-through entity is based on its legal status as a partnership. Accordingly, the Partnership is not required to take any tax positions in order to qualify as a pass-through entity. The Partnership is required to file and does file tax returns with the Internal Revenue Service and other taxing authorities. Accordingly, these financial statements do not reflect a provision for income taxes and the Partnership has no other tax positions, which must be considered for disclosure. Income tax returns filed by the Partnership are subject to examination by the Internal Revenue Service for a period of three years. While no income tax returns are currently being examined by the Internal Revenue Service, tax years since 2009 remain open. |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description containing the income tax disclosure relating to Partnership that has elected to be treated as a pass-through entity for income tax purposes and, as such, is not subject to income taxes.
+ References
No definition available.
+ Details**Name:**bctc_IncomeTaxRelatingToPartnershipDisclosureTextBlock**Namespace Prefix:**bctc_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IncomeTaxDisclosureAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |