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Condensed Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash Flows from Operating Activities:    
Net income (loss) $ 5,076,144 $ (6,771,289)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Increase in commodity futures trading account - cash and cash equivalents (243,632) (2,294,705)
Unrealized (gain) loss on open futures contracts (4,930,270) 953,790
Decrease in receivable from General Partner 54,039 96,862
(Increase) decrease in dividend receivable 50 (56)
Increase in interest receivable 0 (20)
Increase in other assets (3,304) (2,270)
Decrease investment payable 0 (8)
Decrease in professional fees payable (94,201) (126,003)
Increase in General Partner management fees payable 308 3,825
Decrease in brokerage commissions payable (400) (972)
Increase (decrease) in other liabilities (165) 948
Net cash used in operating activities (141,431) (8,139,898)
Cash Flows from Financing Activities:    
Addition of partnership units 3,480,456 15,024,496
Redemption of partnership units (7,296,056) (844,650)
Net cash provided by (used in) financing activities (3,815,600) 14,179,846
Net Increase (Decrease) in Cash and Cash Equivalents (3,957,031) 6,039,948
Cash and Cash Equivalents, beginning of period 39,667,209 19,719,092
Cash and Cash Equivalents, end of period $ 35,710,178 $ 25,759,040