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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Derivatives not Accounted for as Hedging Instruments Futures - Commod  
Location of Gain (Loss) on Derivatives Recognized in Income Change in unrealized
gain (loss) on open
positions
 
Realized Gain (Loss) on Derivatives Recognized in Income $ 17,521,380 $ (20,620,370)
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income $ 1,048,950 $ 3,364,120
Commodity Contract [Member]    
Location of Gain (Loss) on Derivatives Recognized in Income Realized gain (loss) on
closed positions