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Short-term Bank Loans (Tables)
3 Months Ended
Dec. 31, 2012
SCHEDULE OF FACILITIES SECURED BY THE COMPANY'S ASSETS [Table Text Block]
    September 30,     December 31,  
    2012     2012  
             
For short- term bank loans            
Inventories $ 23,863,691   $ 24,072,024  
Machinery and equipment, net   47,255,604     45,722,332  
Land use rights, buildings and construction in progress of BAK Industrial Park   107,140,980     107,340,987  
Land use rights #1 and buildings of Tianjin Industrial Park Zone   23,970,502     23,844,413  
    202,230,777     200,979,756  
For long- term bank loans (Note 8)            
Land use right and construction in progress of Research and Development Test Centre   34,796,887     39,369,580  
             
For other long- term loans            
Land use rights #2 of Tianjin Industrial Park Zone   9,566,555     9,595,552  
  $ 246,594,219   $ 249,944,888