Condensed Schedule of Investments (USD $)	Mar. 31, 2012		Dec. 31, 2011
United States Treasury bills
Treasury Bill, Face Value	$ 3,000,000	[1]	$ 4,000,000	[2]
Treasury Bill, Fair Value	2,999,990		3,999,691
Treasury Bill, Percent of Net Assets	70.24%		75.84%
Futures Contracts
Futures contract held long - Agriculture, Fair Value	(250)		504
Futures contract held long - Agriculture, Percent of Net Assets			0.01%
Futures contract held long - Energy, Fair Value			6,260
Futures contract held long - Energy, Percent of Net Assets			0.12%
Futures contract held long - Currency, Fair Value			62,269
Futures contract held long - Currency, Percent of Net Assets			1.18%
Total futures contracts held long, Fair Value	(250)		69,033
Total futures contracts held long, Percent of Net Assets			1.31%
Futures contracts held short - Agriculture, Fair Value	160		(6,388)
Futures contracts held short - Agriculture, Percent of Net Assets			(0.12%)
Futures contract held short - Energy, Fair Value			53,130
Futures contract held short - Energy, Percent of Net Assets			1.01%
Futures contract held short - Currency, Fair Value			(1,975)
Futures contract held short - Currency, Percent of Net Assets			(0.04%)
Total futures contracts held short, Fair Value	160		44,767
Total futures contracts held short, Percent of Net Assets			0.85%
Net unrealized (loss) on open futures contracts, Fair Value	(90)		113,800
Net unrealized (loss) on open futures contracts, Percent of Net Assets			$ 2.16%

[1] Matures April 2012 (cost $2,999,924)

[2] Matures January 2012 (cost $3,986,110)