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Short-term Bank Loans (Tables) | 6 Months Ended
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Mar. 31, 2013
SCHEDULE OF FACILITIES SECURED BY THE COMPANY'S ASSETS [Table Text Block] |
|  |  | September 30, |  |  | March 31, |
|  |  | 2012 |  |  | 2013 |
| For short- term bank loans |  |  |  |  |  |
| Inventories | $ | 23,863,691 |  | $ | 24,163,958 |
| Machinery and equipment, net |  | 47,255,604 |  |  | 44,076,028 |
| Land use rights, buildings and construction in |  |  |  |  |  |
| progress of BAK Industrial Park |  | 107,140,980 |  |  | 105,336,168 |
| Land use rights #1 of Tianjin Industrial Park Zone |  | 23,970,502 |  |  | 23,907,306 |
|  |  | 202,230,777 |  |  | 197,483,460 |
| For long- term bank loans (Note 8) |  |  |  |  |  |
| Land use right and construction in progress of |  | 34,796,887 |  |  | 40,723,035 |
| Research and Development Test Centre |  |  |  |  |  |
| For other long- term loans |  |  |  |  |  |
| Land use rights #2 of Tianjin Industrial Park Zone |  | 9,566,555 |  |  | 9,577,458 |
|  | $ | 246,594,219 |  | $ | 247,783,953 |

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- Definition Tabular disclosure of the carrying amount and classification of assets and liabilities recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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