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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (50,843) $ (231,598) $ 605,720 $ (2,808,405)
Change in unrealized gain (loss) on open futures contracts 38,153 (453,152) (3,071,320) 3,425,855
Dividend income 7,678 2,506 20,029 6,685
Interest income [1] 14,821 9,059 37,441 23,986
ETF transaction fees 0 0 1,400 1,050
Total income (loss) 9,809 (673,185) (2,406,730) 649,171
Expenses        
General Partner management fees (Note 3) 17,818 27,045 62,706 73,865
Professional fees 21,789 32,673 52,800 84,943
Brokerage commissions 507 771 1,604 2,601
Directors' fees and insurance 500 411 1,432 2,469
License fees 356 541 1,254 1,477
Total expenses 40,970 61,441 119,796 165,355
Expense waiver (Note 3) (19,588) (28,986) (44,548) (76,717)
Net expenses 21,382 32,455 75,248 88,638
Net income (loss) $ (11,573) $ (705,640) $ (2,481,978) $ 560,533
Net income (loss) per limited partnership share $ (0.01) $ (0.50) $ (1.74) $ 0.42
Net income (loss) per weighted average limited partnership share $ (0.01) $ (0.50) $ (2.31) $ 0.41
Weighted average limited partnership shares outstanding 950,000 1,400,000 1,075,458 1,378,467
[1] Interest income does not exceed paid in kind of 5%.