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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ (366,417) $ 288,081
Change in unrealized gain (loss) on open futures contracts 407,377 (2,185,571)
Dividend income 7,514 5,695
Interest income [1] 18,595 10,633
ETF transaction fees 1,050 1,050
Total income (loss) 68,119 (1,880,112)
Expenses    
General Partner management fees (Note 3) 14,371 25,388
Professional fees 19,664 18,752
Brokerage commissions 318 434
Directors' fees and insurance 415 438
License fees 287 508
Total expenses 35,055 45,520
Expense waiver (Note 3) (17,762) (15,053)
Net expenses 17,293 30,467
Net income (loss) $ 50,826 $ (1,910,579)
Net income (loss) per limited partnership share $ 0.03 $ (1.1)
Net income (loss) per weighted average limited partnership share $ 0.06 $ (1.48)
Weighted average limited partnership shares outstanding 837,222 1,292,222
[1] Interest income does not exceed paid in kind of 5%.