11. Financial Highlights (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012	Dec. 31, 2011
Details
Net unit value, start of period	$ 2,692.59	[1]	$ 3,219.98	[1]
Net realized and unrealized gain (loss) from investments, per unit	$ (7.00)	[1]	$ (114.36)	[1]
Investment income per unit	$ 0.06	[1]	$ 0.24	[1]
Expenses, per unit	$ (105.15)	[1]	$ (113.86)	[1]
Net (decrease) in net assets resulting from operations for the period, per unit	$ (112.09)	[1]	$ (227.98)	[1]
Net unit value, end of period	$ 2,580.50	[1]	$ 2,992.00	[1]
Assets, Net, end of period	$ 3,630,771	[1]	$ 4,271,288	[1]	$ 4,232,244	$ 5,273,657
Total Return	(4.16%)	[2]	(7.08%)	[2]
Total partnership units outstanding, end of period	1,407.003		1,427.570		1,571.814	1,637.790
Net investment (loss) over Net Assets	(16.39%)	[3]	(14.39%)	[3]
Expenses over Net Assets	(16.41%)	[3]	(14.42%)	[3]

[1] Investment income and expenses and net realized and unrealized gains and (losses) on futures transactions are calculated based on a single unit outstanding during the period.

[2] Not annualized.

[3] Annualized.