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Accrued expenses and other payable and Obligations arising from loan guarantees (Narrative) (Details) | 3 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY
Accrued Expenses And Other Payable And Obligations Arising From Loan Guarantees 1 | $ 1,224,000 |
Accrued Expenses And Other Payable And Obligations Arising From Loan Guarantees 2 | 2,181,000 |
Accrued Expenses And Other Payable And Obligations Arising From Loan Guarantees 3 |  | 16,000,000
Accrued Expenses And Other Payable And Obligations Arising From Loan Guarantees 4 | 2,567,683 |
Accrued Expenses And Other Payable And Obligations Arising From Loan Guarantees 5 |  | 30,000,000
Accrued Expenses And Other Payable And Obligations Arising From Loan Guarantees 6 | 4,814,404 |
Accrued Expenses And Other Payable And Obligations Arising From Loan Guarantees 7 |  | 46,000,000
Accrued Expenses And Other Payable And Obligations Arising From Loan Guarantees 8 | $ 7,360,706 |

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