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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash Flows from Operating Activities:    
Net income (loss) $ (712,840) $ 2,111,970
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
(Increase) decrease in commodity futures trading account - cash and cash equivalents 2,629,896 710,551
Unrealized (gain) loss on open commodity futures contracts (3,758,409) 260,470
(Increase) decrease in receivable from General Partner 24,503 21,835
(Increase) decrease in dividends receivable 8 400
(Increase) decrease in directors' fees and insurance receivable (792) (1,706)
(Increase) decrease in ETF transaction fees receivable 350 0
Increase (decrease) in General Partner management fees payable (1,662) (7,183)
Increase (decrease) in professional fees payable (36,578) (56,020)
Increase (decrease) in brokerage commissions payable 0 (1,260)
Increase (decrease) in license fees payable 10 (331)
Net cash provided by (used in) operating activities (1,855,514) 3,038,726
Cash Flows from Financing Activities:    
Addition of partnership shares 9,087,798 0
Redemption of partnership shares (8,685,853) (11,987,259)
Net cash provided by (used in) financing activities 401,945 (11,987,259)
Net Increase (Decrease) in Cash and Cash Equivalents (1,453,569) (8,948,533)
Cash and Cash Equivalents, beginning of period 15,113,447 25,514,584
Cash and Cash Equivalents, end of period $ 13,659,878 $ 16,566,051