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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash Flows from Operating Activities:    
Net income (loss) $ 19,932,422 $ 18,857,204
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on open futures contracts (11,816,880) (1,048,950)
(Increase) decrease in receivable from General Partner 72,247 (77,459)
(Increase) decrease in dividends receivable (28,368) (22,163)
(Increase) decrease in interest receivable (826) 5,768
(Increase) decrease in directors' fees and insurance receivable (3,223) (2,346)
(Increase) decrease in ETF transaction fees receivable   350
Increase (decrease) in payable due to Broker 2,500,038  
Increase (decrease) in General Partner management fees payable 3,968 96
Increase (decrease) in professional fees payable (139,217) (55,439)
Increase (decrease) in payable due to Broker 0 (2,500)
Increase (decrease) in directors' fees and insurance payable (1,379) (1,128)
Net cash provided by (used in) operating activities 10,518,782 17,653,433
Cash Flows from Financing Activities:    
Addition of partnership shares 11,705,130 12,284,480
Redemption of partnership shares (13,425,987) (23,776,740)
Net cash provided by (used in) financing activities (1,720,857) (11,492,260)
Net Increase (Decrease) in Cash and Cash Equivalents 8,797,925 6,161,173
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 $ 88,855,567 $ 98,672,676