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Condensed Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash Flows from Operating Activities:    
Net income (loss) $ 2,122,933 $ (4,544,016)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Decrease in commodity futures trading account - cash and cash equivalents 1,365,056 3,423,722
Unrealized (gain) loss on futures contracts 440,820 (6,397,620)
Decrease in receivable from General Partner 35,716 84,248
(Increase) decrease in dividend receivable 45 (104)
Decrease in interest receivable 0 8
Increase in other assets (2,328) (1,789)
Decrease in investment payable 0 (8)
Decrease in professional fees payable (63,079) (100,932)
Increase (decrease) in General Partner management fees payable (11,244) 7,660
Decrease in brokerage commissions payable (1,400) (252)
Increase (decrease) in other liabilities (702) 476
Net cash provided by (used in) operating activities 3,885,817 (7,528,607)
Cash Flows from Financing Activities:    
Addition of partnership units 3,480,456 23,249,910
Redemption of partnership units (22,880,541) (1,663,200)
Net cash provided by (used in) financing activities (19,400,085) 21,586,710
Net Increase (Decrease) in Cash and Cash Equivalents (15,514,268) 14,058,103
Cash and Cash Equivalents, beginning of period 39,667,209 19,719,092
Cash and Cash Equivalents, end of period $ 24,152,941 $ 33,777,195