Statements of Income and Expenses - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment Income:
Interest income (Note 3c)		$ 295,297	$ 166,743	$ 28,030
Expenses:
Ongoing selling agent fees (Note 3c)		1,306,265	1,582,889	2,053,315
Clearing fees		796,605	562,239	648,977
Advisory fees (Note 3b)		1,310,989	1,589,074	2,079,389
Administrative fees (Note 3a)		655,495	794,540	1,039,694
Professional fees		200,106	272,636	309,868
Other		149,895	114,191	83,139
Total expenses		4,419,355	4,915,569	6,214,382
Net investment income (loss)		(4,124,058)	(4,748,826)	(6,186,352)
Net gains (losses) on trading of commodity interests:
Net realized gains (losses) on closed contracts		5,742,840	8,064,452	8,821,652
Change in net unrealized gains (losses) on open contracts		31,648	(30,088)	337,103
Total trading results		5,774,488	8,034,364	9,158,755
Net income (loss) before allocation to Special Limited Partner		1,650,430	3,285,538	2,972,403
Allocation to Special Limited Partner (Note 3b)		(453,819)	(2,588)
Net income (loss):
Net income (loss)		1,196,611	3,282,950	2,972,403
Class A [Member]
Net income (loss):
Net income (loss)		$ 1,136,990	$ 3,199,587	$ 2,738,420
Net income (loss) per unit (Note 6):*
Net income (loss) per unit	[1]	$ 18.21	$ 51.70	$ 24.82
Weighted average units outstanding:
Weighted average units outstanding		50,815.33	64,617.45	85,246.71
Class D [Member]
Net income (loss):
Net income (loss)		$ 27,695	$ 50,707	$ 223,675
Net income (loss) per unit (Note 6):*
Net income (loss) per unit	[1]	$ 32.11	$ 67.19	$ 41.13
Weighted average units outstanding:
Weighted average units outstanding		527.33	767.41	2,132.00
Class GP [Member]
Net income (loss):
Net income (loss)	[2],[3]	$ 31,926	$ 32,656	$ 10,308
Net income (loss) per unit (Note 6):*
Net income (loss) per unit	[1],[2]	$ 83.68	$ 100.39	$ 31.72
Weighted average units outstanding:
Weighted average units outstanding	[2]	402.17	325.64	325.00

[1] Based on change in net asset value per unit.

[2] Class GP commenced on May 1, 2015 (325.0000 units)

[3] Class GP commenced on May 1, 2015.