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Condensed Statements of Operations - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Gain (loss) on trading of commodity futures contracts: |  |  |  |  |
Realized gain (loss) on closed futures contracts |  | $ (390,455) | $ 501,686 | $ 6,228,639 | $ (11,487,686)
Change in unrealized gain (loss) on open futures contracts |  | 10,164,685 | (3,306,626) | (17,358,999) | 30,005,207
Dividend income |  | 51,363 | 20,080 | 137,832 | 39,001
Interest income | [1] | 219,011 | 77,074 | 471,942 | 196,097
ETF transaction fees |  | 2,800 | 2,800 | 7,350 | 12,600
Total income (loss) |  | 10,047,404 | (2,704,986) | (10,513,236) | 18,765,219
Expenses |  |  |  |  |
General Partner management fees (Note 3) |  | 168,628 | 174,407 | 501,114 | 482,870
Professional fees |  | 33,197 | 20,210 | 158,997 | 63,186
Brokerage commissions |  | 4,643 | 4,869 | 13,484 | 17,285
Directors' fees and insurance |  | 3,844 | 2,860 | 10,432 | 7,895
License fees |  | 4,216 | 4,360 | 12,528 | 12,072
Total expenses |  | 214,528 | 206,706 | 696,555 | 583,308
Net income (loss) |  | $ 9,832,876 | $ (2,911,692) | $ (11,209,791) | $ 18,181,911
Net income (loss) per limited partnership share |  | $ 1.52 | $ (0.59) | $ (2.08) | $ 1.75
Net income (loss) per weighted average limited partnership share |  | $ 1.53 | $ (0.45) | $ (1.81) | $ 2.94
Weighted average limited partnership shares outstanding |  | 6,439,130 | 6,411,413 | 6,179,670 | 6,190,511
[1] | Interest income does not exceed paid in kind of 5%.

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