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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed commodity futures contracts $ (206,518,620) $ (126,561,127) $ 230,893,690
Change in unrealized gain (loss) on open commodity futures contracts 6,313,791 46,252,567 (122,742,937)
Realized gain (loss) on short-term investments   93 (15,781)
Dividend income 832,573 582,039 569,787
Interest income [1] 1,846,120 6,027,693 5,960,666
ETF transaction fees 158,070 120,000 194,000
Total Income (Loss) (197,368,066) (73,578,735) 114,859,425
Expenses      
General Partner management fees (Note 3) 2,413,189 1,820,281 2,259,093
Professional fees 647,911 802,399 928,798
Brokerage commissions 1,879,043 1,155,153 1,424,713
Directors' fees and insurance 83,030 70,739 69,624
License fees 60,330 45,507 56,477
Registration fees 364,200 144,440 83,258
Total Expenses 5,447,703 4,038,519 4,821,963
Net Income (Loss) $ (202,815,769) $ (77,617,254) $ 110,037,462
Net Income (Loss) per limited partner share $ (7.71) $ (7.44) $ 1.01
Net Income (Loss) per weighted average limited partner share $ (6.11) $ (5.39) $ 6.73
Weighted average limited partner shares outstanding 33,208,424 14,401,574 16,359,928
[1] Interest income does not exceed paid in kind of 5%.