Changes in Net Assets (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes In Net Assets
Net assets at beginning of period	$ 99,674,394	$ 100,342,985	$ 115,876,755
Capital contributions	23,413,500	26,946,853	22,468,676
Redemptions	28,271,589	35,442,504	28,710,622
Net (decrease) increase from operations	(11,103,143)	7,827,060	(9,291,824)
NET ASSETS AT END OF PERIOD	$ 83,713,162	$ 99,674,394	$ 100,342,985