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Condensed Statements of Operations - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed futures contracts		$ 5,789,281	$ 474,575	$ 10,264,256	$ 6,619,094
Change in unrealized gain (loss) on open futures contracts		3,598,029	(10,335,615)	5,462,074	(27,523,684)
Dividend income		60,127	43,444	114,237	86,469
Interest income	[1]	287,399	144,453	528,254	252,931
ETF transaction fees		1,050	2,800	3,500	4,550
Total income (loss)		9,735,886	(9,670,343)	16,372,321	(20,560,640)
Expenses
General Partner management fees (Note 3)		126,585	159,419	253,881	332,486
Professional fees		36,319	53,800	74,415	125,800
Brokerage commissions		2,645	4,709	3,219	8,841
Directors' fees and insurance		3,583	3,468	6,814	6,588
License fees		3,165	3,985	6,347	8,312
Total expenses		172,297	225,381	344,676	482,027
Net income (loss)		$ 9,563,589	$ (9,895,724)	$ 16,027,645	$ (21,042,667)
Net income (loss) per limited partnership share		$ 2.72	$ (1.73)	$ 4.32	$ (3.60)
Net income (loss) per weighted average limited partnership share		$ 2.70	$ (1.63)	$ 4.28	$ (3.48)
Weighted average limited partnership shares outstanding		3,541,758	6,056,044	3,746,133	6,047,790
[1] Interest income does not exceed paid in kind of 5%.

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