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Condensed Statements of Operations - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed futures contracts		$ 7,012,170	$ 5,214,730	$ 14,459,540	$ 22,736,110
Change in unrealized gain (loss) on open futures contracts		(12,158,780)	(770,460)	(341,900)	278,490
Dividend income		133,489	136,916	455,302	307,484
Interest income	[1]	345,384	347,993	1,096,830	887,974
ETF transaction fees		1,750	3,500	6,300	9,100
Total income (loss)		(4,665,987)	4,932,679	15,676,072	24,219,158
Expenses
General Partner management fees (Note 3)		162,830	188,880	504,194	546,608
Professional fees		36,421	8,822	53,778	102,340
Brokerage commissions		26,184	24,990	77,908	73,083
Directors' fees and insurance		5,318	4,317	13,905	11,712
Total expenses		230,753	227,009	649,785	733,743
Expense waiver (Note 3)		(35,357)	(599)	(44,752)	(78,058)
Net expenses		195,396	226,410	605,033	655,685
Net income (loss)		$ (4,861,383)	$ 4,706,269	$ 15,071,039	$ 23,563,473
Net income (loss) per limited partnership share		$ (1.04)	$ 1.07	$ 2.91	$ 5.10
Net income (loss) per weighted average limited partnership share		$ (1.04)	$ 1.00	$ 3.14	$ 4.86
Weighted average limited partnership shares outstanding		4,665,217	4,703,261	4,806,227	4,851,648
[1] Interest income does not exceed paid in kind of 5%.

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