Statements of Income and Expenses (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Investment income:
Interest income allocated from Master (Note 3c)	$ 66,715		$ 50,151		$ 166,148
Expenses:
Expenses allocated from Master	700,733		636,576		967,150
Brokerage commissions (Note 3c)	2,173,527		2,143,088		3,312,893
Management fees (Note 3b)	3,367,119		4,160,115		5,198,291
Professional fees	89,797		69,836		138,088
Other	36,207		42,869		23,877
Total expenses	6,367,383		7,052,484		9,640,299
Net investment income (loss)	(6,300,668)		(7,002,333)		(9,474,151)
Trading Results:
Net realized gains (losses) on closed contracts allocated from Master	29,650,467		(26,151,711)		(15,586,893)
Change in net unrealized gains (losses) on open contracts allocated from Master	(27,820,829)		39,628,299		4,587,763
Total trading results allocated from Master	1,829,638		13,476,588		(10,999,130)
Net income (loss)	$ (4,471,030)		$ 6,474,255		$ (20,473,281)
Net income (loss) per unit (Note 6)	$ (252.83)	[1]	$ 352.08	[1]	$ (824.28)	[1]
Weighted average units outstanding	16,272.9543		20,371.3226		24,721.7604

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