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Condensed Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash Flows from Operating Activities:    
Net income $ 4,123,551 $ 2,678,596
Adjustments to reconcile net income to net cash provided by operating activities:    
(Increase) decrease in commodity futures trading account - cash and cash equivalents 1,754,743 (964,094)
Unrealized (gain) loss on open futures contracts (480,220) 937,210
Decrease in receivable from General Partner 75,414 9,284
(Increase) decrease in dividend receivable (536) 162
Increase in interest receivable (17) 0
Increase in other assets (2,156) (1,390)
Increase (decrease) in professional fees payable (57,339) 23,618
Increase in General Partner management fees payable 4,106 15,147
Increase in brokerage commissions payable 505 470
Increase in other liabilities 121 804
Net cash provided by operating activities 5,418,172 2,699,807
Cash Flows from Financing Activities:    
Addition of partnership units 80,992,276 96,578,235
Redemption of partnership units (61,484,586) (77,002,991)
Net cash provided by financing activities 19,507,690 19,575,244
Net Increase in Cash and Cash Equivalents 24,925,862 22,275,051
Cash and Cash Equivalents, beginning of period 29,961,706 9,140,476
Cash and Cash Equivalents, end of period $ 54,887,568 $ 31,415,527