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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash Flows from Operating Activities:    
Net income (loss) $ 21,093,603 $ 3,496,534
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 21,325,189 11,328,128
Unrealized (gain) loss on open futures contracts (33,311,833) (15,811,271)
(Increase) decrease in dividends receivable (4,317) 49
(Increase) decrease in directors' fees and insurance receivable (570) (572)
(Increase) decrease in ETF transaction fees receivable 0 350
Increase (decrease) in payable due to Broker 4,220,012 0
Increase (decrease) in General Partner management fees payable 25,770 22,189
Increase (decrease) in professional fees payable (106,943) (99,564)
Increase (decrease) in brokerage commissions payable 2,200 2,250
Increase (decrease) in directors' fees and insurance payable (742) (16)
Increase (decrease) in license fees payable 2,119 1,658
Net cash provided by (used in) operating activities 13,244,488 (1,060,265)
Cash Flows from Financing Activities:    
Addition of partnership shares 39,299,030 54,849,658
Redemption of partnership shares (10,078,068) (13,733,080)
Net cash provided by (used in) financing activities 29,220,962 41,116,578
Net Increase (Decrease) in Cash and Cash Equivalents 42,465,450 40,056,313
Cash and Cash Equivalents, beginning of period 61,380,282 33,464,533
Cash and Cash Equivalents, end of period $ 103,845,732 $ 73,520,846