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Receivables from Former Subsidiaries, trade payable to and advance from former subsidiaries (Tables) | 9 Months Ended
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Jun. 30, 2015
Schedule of Receivable From A Former Subsidiary [Table Text Block] |
|  |  | September 30, |  |  | June 30, |
|  |  | 2014 |  |  | 2015 |
| Shenzhen BAK | $ | 1,856,356 |  | $ | - |
| BAK Tianjin |  | 7,261,089 |  |  | - |
|  |  | 9,117,445 |  |  | - |
| Allowance for doubtful debts |  | (1,856,356 | ) |  | - |
| Carrying amount | $ | 7,261,089 |  | $ | - |
Schedule of Trade Payable To a Former Subsidiary [Table Text Block] |
|  |  | September 30, |  |  | June 30, |
|  |  | 2014 |  |  | 2015 |
| BAK Tianjin | $ | - |  | $ | 2,555,860 |
Schedule of Advance From A Former Subsidiary [Table Text Block] |
|  |  | September 30, |  |  | June 30, |
|  |  | 2014 |  |  | 2015 |
| Shenzhen BAK | $ | - $ |  |  | 77,134 |

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