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Condensed Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash Flows from Operating Activities:    
Net income $ 7,385,136 $ 5,026,076
Adjustments to reconcile net income to net cash provided by operating activities:    
Increase in commodity futures trading account - cash and cash equivalents (1,351,996) (1,459,978)
Unrealized gain on futures contracts (1,154,200) (1,164,000)
Decrease in receivable from General Partner 96,365 70,119
Increase in dividend receivable (260) (394)
Increase in interest receivable (12)  
Increase in other assets (4,658) (1,510)
Increase in General Partner management fees payable 11,882 22,864
Decrease in professional fees payable (117,466) (70,216)
Increase in brokerage commissions payable 295 1,350
Increase in other liabilities 196 201
Net cash provided by operating activities 4,865,282 2,424,512
Cash Flows from Financing Activities:    
Addition of partnership units 49,776,251 59,009,256
Redemption of partnership units (33,970,966) (6,535,913)
Net cash provided by financing activities 15,805,285 52,473,343
Net Increase in Cash and Cash Equivalents 20,670,567 54,897,855
Cash and Cash Equivalents, beginning of period 29,961,706 9,140,476
Cash and Cash Equivalents, end of period $ 50,632,273 $ 64,038,331