Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flows from Operating Activities:
Net loss	$ (4,829,192)	$ (14,345,494)	$ (13,719,991)
Adjustments to reconcile net loss to net cash used in operating activities:
(Increase) decrease in commodity futures trading account - cash and cash equivalents	5,715,124	(3,164,487)	(3,026,276)
Unrealized (gain) loss on futures contracts	(7,676,740)	6,408,260	3,837,730
(Increase) decrease in receivable from General Partner	44,666	38,520	(15,011)
(Increase) decrease in dividend receivable	(228)	868	(334)
(Increase) decrease in interest receivable	8	(8)	0
(Increase) decrease in other assets	(118)	355	(558)
Increase (decrease) in investment payable	(8)	8	0
Increase (decrease) in professional fees payable	(25,802)	(53,930)	64,205
Increase (decrease) in General Partner management fees payable	13,964	(9,196)	8,874
Increase (decrease) in brokerage commissions payable	(252)	(425)	1,485
Increase (decrease) in other liabilities	1,358	(1,681)	1,904
Net cash used in operating activities	(6,757,220)	(11,127,210)	(12,847,972)
Cash Flows from Financing Activities:
Addition of partnership units	33,083,248	10,130,630	30,789,052
Redemption of partnership units	(6,377,911)	(9,597,603)	(19,684,196)
Net cash provided by financing activities	26,705,337	533,027	11,104,856
Net Increase (Decrease) in Cash and Cash Equivalents	19,948,117	(10,594,183)	(1,743,116)
Cash and Cash Equivalents, beginning of year	19,719,092	30,313,275	32,056,391
Cash and Cash Equivalents, end of year	$ 39,667,209	$ 19,719,092	$ 30,313,275