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Condensed Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash Flows from Operating Activities:    
Net income $ 1,131,849 $ 4,123,551
Adjustments to reconcile net income to net cash provided by operating activities:    
Decrease in commodity futures trading account - cash and cash equivalents 944,253 1,754,743
Unrealized (gain) loss on futures contracts 2,378,680 (480,220)
(Increase) decrease in receivable from General Partner (3,229) 75,414
(Increase) decrease in dividend receivable 535 (536)
Increase in interest receivable 0 (17)
Increase in other assets (857) (2,156)
Decrease in professional fees payable (26,481) (57,339)
Increase (decrease) in General Partner management fees payable (2,614) 4,106
Increase (decrease) in brokerage commissions payable (240) 505
Increase in other liabilities 131 121
Net cash provided by operating activities 4,422,027 5,418,172
Cash Flows from Financing Activities:    
Addition of partnership units 58,653,136 80,992,276
Redemption of partnership units (64,579,320) (61,484,586)
Net cash provided by (used in) financing activities (5,926,184) 19,507,690
Net Increase (Decrease) in Cash and Cash Equivalents (1,504,157) 24,925,862
Cash and Cash Equivalents, beginning of period 39,506,019 29,961,706
Cash and Cash Equivalents, end of period $ 38,001,862 $ 54,887,568