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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash Flows from Operating Activities:    
Net income (loss) $ 19,896,460 $ 4,562,389
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts (6,341,280) 1,175,940
(Increase) decrease in receivable from General Partner (6,005) (59,168)
(Increase) decrease in dividends receivable (49,321) (10,933)
(Increase) decrease in interest receivable (75) 2,788
Increase (decrease) in General Partner management fees payable 3,443 (9,238)
Increase (decrease) in professional fees payable (83,543) (1,247)
Increase (decrease) in brokerage commissions payable 0 (2,500)
Increase (decrease) in directors' fees and insurance payable 1,626 1,179
Net cash provided by (used in) operating activities 13,421,305 5,659,210
Cash Flows from Financing Activities:    
Addition of partnership shares 7,937,858 3,704,236
Redemption of partnership shares (7,298,509) (12,686,394)
Net cash provided by (used in) financing activities 639,349 (8,982,158)
Net Increase (Decrease) in Cash and Cash Equivalents 14,060,654 (3,322,948)
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 $ 94,118,296 $ 89,188,555