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Bonds Payable (Details 2)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Future amortization of long-term deferred expenses      
2015   5,134,902born_DeferredCostsAmortizationNextTwelveMonths  
2016   427,908born_DeferredCostsAmortizationYearTwo  
Total $ 909,104us-gaap_DeferredFinanceCostsNoncurrentNet 5,562,810us-gaap_DeferredFinanceCostsNoncurrentNet 10,697,712us-gaap_DeferredFinanceCostsNoncurrentNet