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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities:    
Net income (loss) $ 18,857,204 $ (17,395,702)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts (1,048,950) (3,364,120)
(Increase) decrease in receivable from General Partner (77,459) 6,267
(Increase) decrease in dividends receivable (22,163) (1,895)
(Increase) decrease in interest receivable 5,768 0
(Increase) decrease in directors' fees and insurance receivable (2,346) (1,960)
(Increase) decrease in ETF transaction fees receivable 350 700
Increase (decrease) in General Partner management fees payable 96 (14,967)
Increase (decrease) in professional fees payable (55,439) (30,754)
Increase (decrease) in brokerage commissions payable (2,500) (1,860)
Increase (decrease) in directors' fees and insurance payable (1,128) (1,184)
Net cash provided by (used in) operating activities 17,653,433 (20,805,475)
Cash Flows from Financing Activities:    
Addition of partnership shares 12,284,480 40,082,469
Redemption of partnership shares (23,776,740) (21,090,615)
Net cash provided by (used in) financing activities (11,492,260) 18,991,854
Net Increase (Decrease) in Cash and Cash Equivalents 6,161,173 (1,813,621)
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 98,672,676 109,651,256
Components of Cash and Cash Equivalents:    
Cash and Cash Equivalents 90,179,694 97,601,807
Equity in Trading Accounts:    
Cash and Cash Equivalents 8,492,982 12,049,449
Total Cash, Cash Equivalents and Equity in Trading Accounts $ 98,672,676 $ 109,651,256