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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash Flows from Operating Activities:      
Net income (loss) $ 2,869,424 $ (4,548,413) $ (3,971,981)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
(Increase) decrease in commodity futures trading account - cash and cash equivalents 3,622,568 1,202,800 (4,576,085)
Unrealized (gain) loss on open futures contracts (5,217,980) (2,497,914) 6,009,940
(Increase) decrease in receivable from General Partner (12,970) (22,856) 34,314
(Increase) decrease in dividends receivable (1,337) 96 425
(Increase) decrease in directors' fees and insurance receivable 1,197 (85) (277)
(Increase) decrease in ETF transaction fees receivable (350) 350 (350)
Increase (decrease) in payable due to Broker 2,099,689 0 0
Increase (decrease) in General Partner management fees payable 2,510 (3,142) (7,276)
Increase (decrease) in professional fees payable 27,360 (5,108) (70,453)
Increase (decrease) in brokerage commissions payable 0 220 (1,027)
Increase (decrease) in directors' fees and insurance payable 106 0 0
Increase (decrease) in license fees payable (84) (170) (372)
Net cash provided by (used in) operating activities 3,390,133 (5,874,222) (2,583,142)
Cash Flows from Financing Activities:      
Addition of partnership shares 1,418,858 11,863,149 4,169,264
Redemption of partnership shares (967,707) (9,882,640) (11,987,259)
Net cash provided by (used in) financing activities 451,151 1,980,509 (7,817,995)
Net Increase (Decrease) in Cash and Cash Equivalents 3,841,284 (3,893,713) (10,401,137)
Cash and Cash Equivalents, beginning of year 11,219,734 15,113,447 25,514,584
Cash and Cash Equivalents, end of year $ 15,061,018 $ 11,219,734 $ 15,113,447