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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows from Operating Activities:      
Net income (loss) $ (15,190,394) $ 15,451,090 $ 37,005,128
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Unrealized (gain) loss on open futures contracts 11,877,420 (3,255,030) (9,775,220)
(Increase) decrease in receivable from General Partner 249,791 (141,688) (54,380)
(Increase) decrease in dividends receivable (821) (6,613) (10,339)
(Increase) decrease in interest receivable 8,188 (9,575) 0
(Increase) decrease in ETF transaction fees receivable 350 350 0
Increase (decrease) in General Partner management fees payable (11,475) (12,926) 25,134
Increase (decrease) in professional fees payable (52,980) 135,701 (5,790)
Increase (decrease) in brokerage commissions payable (2,500) (1,860) 1,430
Increase (decrease) in directors' fees and insurance payable 251 (56) 523
Net cash provided by (used in) operating activities (3,122,170) 12,159,393 27,186,486
Cash Flows from Financing Activities:      
Addition of partnership shares 41,996,934 40,082,469 41,041,049
Redemption of partnership shares (51,328,625) (71,195,236) (45,491,088)
Net cash provided by (used in) financing activities (9,331,691) (31,112,767) (4,450,039)
Net Increase (Decrease) in Cash and Cash Equivalents (12,453,861) (18,953,374) 22,736,447
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year 92,511,503 111,464,877 88,728,430
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year $ 80,057,642 $ 92,511,503 $ 111,464,877