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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) $ 567,143 $ (3,146,483) $ 2,869,424
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Unrealized (gain) loss on open futures contracts (522,819) 3,364,926 (5,217,980)
(Increase) decrease in receivable from General Partner 1,757 40,379 (12,970)
(Increase) decrease in dividends receivable (260) (831) (1,337)
(Increase) decrease in interest receivable (201) (88) 0
(Increase) decrease in directors' fees and insurance receivable 66 (66) 1,197
(Increase) decrease in ETF transaction fees receivable 0 350 (350)
(Increase) decrease in other assets (216) 0 0
Increase (decrease) in payable due to Broker 81,581 (2,099,689) 2,099,689
Increase (decrease) in General Partner management fees payable (1,784) (4,944) 2,510
Increase (decrease) in professional fees payable (21,209) (29,606) 27,360
Increase (decrease) in brokerage commissions payable (610) (620) 0
Increase (decrease) in directors' fees and insurance payable 641 (106) 106
Increase (decrease) in license fees payable (331) (413) (84)
Net cash provided by (used in) operating activities 103,758 (1,877,191) (232,435)
Cash Flows from Financing Activities:      
Addition of partnership shares 584,722 1,021,619 1,418,858
Redemption of partnership shares (3,843,434) (5,986,374) (967,707)
Net cash provided by (used in) financing activities (3,258,712) (4,964,755) 451,151
Net Increase (Decrease) in Cash and Cash Equivalents (3,154,954) (6,841,946) 218,716
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year 8,918,876 15,760,822 15,542,106
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year $ 5,763,922 $ 8,918,876 $ 15,760,822