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Condensed Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash Flows from Operating Activities:    
Net income $ 2,096,608 $ 5,076,144
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
(Increase) decrease in commodity futures trading account - cash and cash equivalents 640,250 (243,632)
Unrealized gain on futures contracts (508,810) (4,930,270)
Decrease in receivable from General Partner 62,535 54,039
Decrease in dividend receivable 384 50
Increase in other assets (2,279) (3,304)
Decrease in professional fees payable (103,522) (94,201)
Increase (decrease) in General Partner management fees payable (4,921) 308
Decrease in brokerage commissions payable 0 (400)
Decrease in other liabilities (194) (165)
Net cash provided by (used in) operating activities 2,180,051 (141,431)
Cash Flows from Financing Activities:    
Addition of partnership shares 0 3,480,456
Redemption of partnership shares (8,969,857) (7,296,056)
Net cash used in financing activities (8,969,857) (3,815,600)
Net Decrease in Cash and Cash Equivalents (6,789,806) (3,957,031)
Cash and Cash Equivalents, beginning of period 25,514,584 39,667,209
Cash and Cash Equivalents, end of period $ 18,724,778 $ 35,710,178