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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash Flows from Operating Activities:    
Net income (loss) $ 15,071,039 $ 23,563,473
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts 341,900 (278,490)
(Increase) decrease in receivable from General Partner 36,890 253,375
(Increase) decrease in dividends receivable (16,991) (22,587)
(Increase) decrease in interest receivable (904) 2,660
(Increase) decrease in prepaid insurance [1] (2,767) 1,017
(Increase) decrease in ETF transaction fees receivable 0 350
Increase (decrease) in General Partner management fees payable 963 (5,854)
Increase (decrease) in professional fees payable (107,763) (56,795)
Increase (decrease) in brokerage commissions payable 0 (2,500)
Increase (decrease) in directors' fees payable [1] 314 476
Increase (decrease) in insurance payable [1] 0 3,184
Net cash provided by (used in) operating activities 15,322,681 23,458,309
Cash Flows from Financing Activities:    
Addition of partnership shares 17,034,820 23,719,011
Redemption of partnership shares (28,827,507) (38,351,509)
Net cash provided by (used in) financing activities (11,792,687) (14,632,498)
Net Increase (Decrease) in Cash and Cash Equivalents 3,529,994 8,825,811
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 80,057,642 92,511,503
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period $ 83,587,636 $ 101,337,314
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.