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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 $ 679,733 $ 7,385,136
Adjustments to reconcile net income to net cash provided by operating activities:    
(Increase) decrease in commodity futures trading account - cash and cash equivalents 1,852,336 (1,351,996)
Unrealized (gain) loss on open futures contracts 662,270 (1,154,200)
Decrease in receivable from General Partner 32,380 96,365
(Increase) decrease in dividend receivable 314 (260)
Increase in interest receivable 0 (12)
Increase in other assets (2,845) (4,658)
Decrease in professional fees payable (94,457) (117,466)
Increase (decrease) in General Partner management fees payable (573) 11,882
Increase (decrease) in brokerage commissions payable (150) 295
Increase in other liabilities 18 196
Net cash provided by operating activities 3,129,026 4,865,282
Cash Flows from Financing Activities:    
Addition of partnership units 38,093,572 49,776,251
Redemption of partnership units (38,055,216) (33,970,966)
Net cash provided by financing activities 38,356 15,805,285
Net Increase in Cash and Cash Equivalents 3,167,382 20,670,567
Cash and Cash Equivalents, beginning of period 39,506,019 29,961,706
Cash and Cash Equivalents, end of period $ 42,673,401 $ 50,632,273