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4. FAIR VALUE MEASUREMENTS (Details) (USD $)
Jun. 30, 2012
Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments $ 8,752,841 $ 7,261,073
FairValueInputsLevel1Member
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 0 0
FairValueInputsLevel2Member
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 0 0
FairValueInputsLevel3Member
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments $ 8,752,841 $ 7,261,073