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)

v3.4.0.3
DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Reconciliation between the gross assets and liabilities and the amounts reflected on the balance sheet (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Offsetting Assets [Line Items]    
Current assets $ 42,628,541 $ 64,611,558
Current Assets [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 42,628,541 64,611,558
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 42,628,541 64,611,558
Swap Contracts [Member] | Current Assets [Member]    
Offsetting Assets [Line Items]    
Current assets $ 42,628,541 $ 64,611,558