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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash Flows from Operating Activities:    
Net income (loss) $ 1,266,173 $ (712,840)
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 2,647,597 2,629,896
Unrealized (gain) loss on open futures contracts (3,879,007) (3,758,409)
(Increase) decrease in receivable from General Partner 41,391 24,503
(Increase) decrease in dividends receivable (391) 8
(Increase) decrease in directors' fees and insurance receivable 913 (792)
(Increase) decrease in ETF transaction fees receivable (350) 350
Increase (decrease) in General Partner management fees payable 1,073 (1,662)
Increase (decrease) in professional fees payable (15,416) (36,578)
Increase (decrease) in license fees payable (162) 10
Net cash provided by (used in) operating activities 61,821 (1,855,514)
Cash Flows from Financing Activities:    
Addition of partnership shares 926,324 9,087,798
Redemption of partnership shares (422,177) (8,685,853)
Net cash provided by (used in) financing activities 504,147 401,945
Net Increase (Decrease) in Cash and Cash Equivalents 565,968 (1,453,569)
Cash and Cash Equivalents, beginning of period 11,219,734 15,113,447
Cash and Cash Equivalents, end of period $ 11,785,702 $ 13,659,878