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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flows from Operating Activities:    
Net income (loss) $ 6,395,974 $ (2,629,411)
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 512,198 (8,826,163)
Unrealized (gain) loss on open futures contracts (2,346,110) 4,188,770
(Increase) decrease in receivable from General Partner 75,952 66,639
(Increase) decrease in dividends receivable (2,514) (314)
(Increase) decrease in directors' fees and insurance receivable (2,570) (1,502)
(Increase) decrease in ETF transaction fees receivable 0 700
Increase (decrease) in General Partner management fees payable 22,567 42,941
Increase (decrease) in professional fees payable (69,428) (48,113)
Increase (decrease) in brokerage commissions payable 1,430 2,860
Increase (decrease) in directors' fees and insurance payable (661) (338)
Net cash provided by (used in) operating activities 4,586,838 (7,203,931)
Cash Flows from Financing Activities:    
Addition of partnership shares 26,297,285 70,948,692
Redemption of partnership shares (3,763,347) (2,041,445)
Net cash provided by (used in) financing activities 22,533,938 68,907,247
Net Increase (Decrease) in Cash and Cash Equivalents 27,120,776 61,703,316
Cash and Cash Equivalents, beginning of period 67,996,295 36,408,502
Cash and Cash Equivalents, end of period $ 95,117,071 $ 98,111,818