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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 368,482 $ (916,739) $ 656,563 $ (2,576,807)
Change in unrealized gain (loss) on open futures contracts (923,902) 3,565,429 (3,109,473) 3,879,007
Dividend income 6,656 1,587 12,351 4,179
Interest income 11,987 9,076 22,620 14,927
ETF transaction fees 350 350 1,400 1,050
Total income (loss) (536,427) 2,659,703 (2,416,539) 1,322,356
Expenses        
General Partner management fees (Note 3) 19,500 24,275 44,888 46,820
Professional fees 12,259 26,135 31,011 52,270
Brokerage commissions 663 872 1,097 1,830
Directors' fees and insurance 494 1,528 932 2,058
License fees 390 485 898 936
Total expenses 33,306 53,295 78,826 103,914
Expense waiver (Note 3) (9,907) (24,115) (24,960) (47,731)
Net expenses 23,399 29,180 53,866 56,183
Net income (loss) $ (559,826) $ 2,630,523 $ (2,470,405) $ 1,266,173
Net income (loss) per limited partnership share $ (0.63) $ 1.9 $ (1.73) $ 0.92
Net income (loss) per weighted average limited partnership share $ (0.57) $ 1.91 $ (2.17) $ 0.93
Weighted average limited partnership shares outstanding 987,912 1,374,725 1,139,227 1,367,582