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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) $ 21,270,646 $ (11,209,791)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts (3,311,927) 17,358,999
(Increase) decrease in dividends receivable (2,228) (5,522)
(Increase) decrease in interest receivable (2,904) (9,844)
(Increase) decrease in directors' fees and insurance receivable 0 (353)
(Increase) decrease in ETF transaction fees receivable 0 (350)
Increase (decrease) in payable due to Broker (4,828,273) (15,112,791)
Increase (decrease) in General Partner management fees payable (13,260) (10,015)
Increase (decrease) in professional fees payable (48,787) (7,658)
Increase (decrease) in brokerage commissions payable (2,500) 0
Increase (decrease) in directors' fees and insurance payable 3,990 (1,439)
Increase (decrease) in license fees payable (1,043) (1,747)
Net cash provided by (used in) operating activities 13,063,714 (9,000,511)
Cash Flows from Financing Activities:    
Addition of partnership shares 0 22,440,164
Redemption of partnership shares (30,043,941) (28,660,434)
Net cash provided by (used in) financing activities (30,043,941) (6,220,270)
Net Increase (Decrease) in Cash and Cash Equivalents (16,980,227) (15,220,781)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 88,230,084 124,370,598
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period 71,249,857 109,149,817
Components of Cash and Cash Equivalents:    
Cash and Cash Equivalents 66,274,454 89,534,920
Equity in Trading Accounts:    
Cash and Cash Equivalents 4,975,403 19,614,897
Total Cash, Cash Equivalents and Equity in Trading Accounts $ 71,249,857 $ 109,149,817