Schedule Of Investments (Future Contracts) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Gold (1,722 contracts, settlement date August 28, 2013) [Member]
Schedule of Investments [Line Items]
Percentage of Net Assets	(1.49%)
Fair Value	$ (5,263,760)
Silver (460 contracts, settlement date December 27, 2013) [Member]
Schedule of Investments [Line Items]
Percentage of Net Assets	(0.95%)
Fair Value	(3,365,225)
Net Unrealized Depreciation on Futures Contracts [Member]
Schedule of Investments [Line Items]
Percentage of Net Assets	(2.44%)	(10.65%)
Fair Value	(8,628,985)	(48,362,065)
Gold (2,382 Contracts, Settlement Date February 27, 2012) [Member]
Schedule of Investments [Line Items]
Percentage of Net Assets		(6.29%)
Fair Value		(28,566,540)
Silver (608 Contracts, Settlement Date December 27, 2012) [Member]
Schedule of Investments [Line Items]
Percentage of Net Assets		(4.36%)
Fair Value		$ (19,795,525)