Statements of Income and Expenses - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Income:
Interest income (Note 3c)		$ 317,438	$ 109,109
Interest income allocated from the Master (Note 3c)			92,905	$ 45,442
Total investment income		317,438	202,014	45,442
Expenses:
Expenses allocated from the Master			125,277	192,598
Clearing fees related to direct investments (Note 3c)		79,838	41,970
Ongoing selling agent fees (Note 3d)		386,831	529,876	461,501
Management fees (Note 3b)		291,342	400,229	346,035
General Partner fees (Note 3a)		194,227	266,820	230,690
Professional fees		279,058	255,641	331,230
Total expenses		1,231,296	1,619,813	1,562,054
Expenses borne by the General Partner (Note 3a)		(181,320)	(181,311)
Net expenses		1,049,976	1,438,502	1,562,054
Net investment loss		(732,538)	(1,236,488)	(1,516,612)
Net gains (losses) on trading of commodity interests and investment in the Master:
Net realized gains (losses) on closed contracts		(1,544,244)	1,863,780
Net realized gains (losses) on closed contracts allocated from the Master			(903,323)	(2,413,231)
Net change in unrealized gains (losses) on open contracts		291,473	475,211
Net change in unrealized gains (losses) on open contracts allocated from the Master			(252,646)	594,824
Total trading results		(1,252,771)	1,183,022	(1,818,407)
Net income (loss)		(1,985,309)	(53,466)	(3,335,019)
Class A [Member]
Net gains (losses) on trading of commodity interests and investment in the Master:
Net income (loss)		$ (1,970,595)	$ (56,971)	$ (3,313,437)
Net income (loss) per Redeemable Unit	[1]	$ (128.41)	$ 9.76	$ (222.31)
Weighted average Redeemable Units outstanding		15,031.7262	19,944.6721	15,454.5329
Class Z [Member]
Net gains (losses) on trading of commodity interests and investment in the Master:
Net income (loss)		$ (14,714)	$ 3,505	$ (21,582)
Net income (loss) per Redeemable Unit	[1]	$ (71.37)	$ 25.25	$ (87.50)
Weighted average Redeemable Units outstanding		250.6069	357.2938	246.1860

[1] Represents the change in net asset value per Redeemable Unit.