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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash Flows from Operating Activities:    
Net income (loss) $ 23,563,473 $ (2,018,371)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts (278,490) (73,620)
(Increase) decrease in receivable from General Partner 253,375 (60,583)
(Increase) decrease in dividends receivable (22,587) (4,000)
(Increase) decrease in interest receivable 2,660 (7,559)
(Increase) decrease in directors' fees and insurance receivable 0 (404)
(Increase) decrease in ETF transaction fees receivable 350 350
Increase (decrease) in General Partner management fees payable (5,854) (13,754)
Increase (decrease) in professional fees payable (56,795) 53,807
Increase (decrease) in brokerage commissions payable (2,500) (1,860)
Increase (decrease) in directors' fees and insurance payable 4,677 (1,184)
Net cash provided by (used in) operating activities 23,458,309 (2,127,178)
Cash Flows from Financing Activities:    
Addition of partnership shares 23,719,011 40,082,469
Redemption of partnership shares (38,351,509) (53,128,704)
Net cash provided by (used in) financing activities (14,632,498) (13,046,235)
Net Increase (Decrease) in Cash and Cash Equivalents 8,825,811 (15,173,413)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 92,511,503 111,464,877
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period 101,337,314 96,291,464
Components of Cash and Cash Equivalents:    
Cash and Cash Equivalents 86,567,752 82,845,053
Equity in Trading Accounts:    
Cash and Cash Equivalents 14,769,562 13,446,411
Total Cash, Cash Equivalents and Equity in Trading Accounts $ 101,337,314 $ 96,291,464