Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT, Classification of outstanding financial instruments (Details)

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT, Classification of outstanding financial instruments (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Derivative Assets [Abstract]    
Derivative Assets, Current $ 87,881,527 $ 128,893,220
Derivative Assets, Noncurrent 6,330,398 25,013,011
Derivative Liabilities [Abstract]    
Derivative Liabilities, Current (678) 0
Derivative Liabilities, Noncurrent 0 (579,070)
Total Derivatives Liabilities (678) (579,070)
Total Assets [Member]    
Derivative Assets [Abstract]    
Total Derivatives Assets 94,211,925 153,906,231
Swap Contracts [Member] | Current Assets/Liabilities [Member]    
Derivative Assets [Abstract]    
Derivative Assets, Current 87,881,527 128,893,220
Swap Contracts [Member] | Non-Current Assets/Liabilities [Member]    
Derivative Assets [Abstract]    
Derivative Assets, Noncurrent 6,330,398 25,013,011
Swaption Contracts [Member] | Current Assets/Liabilities [Member]    
Derivative Liabilities [Abstract]    
Derivative Liabilities, Current (678) 0
Swaption Contracts [Member] | Non-Current Assets/Liabilities [Member]    
Derivative Liabilities [Abstract]    
Derivative Liabilities, Noncurrent $ 0 $ (579,070)