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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ 7,967,768 $ (7,435,894) $ (24,569,061)
Change in unrealized gain (loss) on open futures contracts (6,205,208) 37,249,404 (2,875,569)
Dividend income 192,015 69,128 5,737
Interest income [1] 685,895 280,850 43,003
ETF transaction fees 11,200 15,750 16,450
Total income (loss) 2,651,670 30,179,238 (27,379,440)
Expenses      
General Partner management fees (Note 3) 646,339 668,511 433,957
Professional fees 235,201 87,599 101,867
Brokerage commissions 17,897 22,207 19,025
Directors' fees and insurance 14,120 10,843 9,808
License fees 16,158 16,713 10,849
Total expenses 929,715 805,873 575,506
Net income (loss) $ 1,721,955 $ 29,373,365 $ (27,954,946)
Net income (loss) per limited partnership share $ 0.66 $ 3.39 $ (9.59)
Net income (loss) per weighted average limited partnership share $ 0.29 $ 4.69 $ (8.87)
Weighted average limited partnership shares outstanding 5,871,781 6,263,251 3,151,781
[1] Interest income does not exceed paid in kind of 5%.