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Condensed Statements of Operations - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed futures contracts		$ (41,649)	$ (57,654)	$ (50,236)	$ (424,071)
Change in unrealized gain (loss) on open futures contracts		(598,531)	175,824	(493,923)	583,201
Dividend income		2,896	5,381	6,798	12,895
Interest income	[1]	22,529	20,224	46,165	38,819
ETF transaction fees		0	350	350	1,400
Total income (loss)		(614,755)	144,125	(490,846)	212,244
Expenses
General Partner management fees (Note 3)		8,330	11,705	17,426	26,076
Professional fees		22,157	16,582	44,072	36,246
Brokerage commissions		264	467	636	785
Directors' fees and insurance		215	338	543	753
License fees		167	234	349	521
Total expenses		31,133	29,326	63,026	64,381
Expense waiver (Note 3)		(21,137)	(15,329)	(42,114)	(33,091)
Net expenses		9,996	13,997	20,912	31,290
Net income (loss)		$ (624,751)	$ 130,128	$ (511,758)	$ 180,954
Net income (loss) per limited partnership share		$ (1.39)	$ 0.20	$ (1.15)	$ 0.23
Net income (loss) per weighted average limited partnership share		$ (1.39)	$ 0.19	$ (1.12)	$ 0.24
Weighted average limited partnership shares outstanding		450,000	670,879	454,972	753,591
[1] Interest income does not exceed paid in kind of 5%.

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Gain (Loss) On Commodity Futures [Abstract]

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