Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT, Reconciliation between the gross assets and liabilities and the amounts reflected on the balance sheet (Details)

v3.3.0.814
DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT, Reconciliation between the gross assets and liabilities and the amounts reflected on the balance sheet (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets $ 94,211,925 $ 153,906,231
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 94,211,925 153,906,231
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (678) (579,070)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0 0
Net Amount of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (678) (579,070)
Current Assets [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 87,881,527 128,893,220
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 87,881,527 128,893,220
Non Current Assets [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 6,330,398 25,013,011
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0 0
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 6,330,398 25,013,011
Current Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (678) 0
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0 0
Net Amount of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (678) 0
Non Current Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities 0 (579,070)
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0 0
Net Amount of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities $ 0 $ (579,070)