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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (126,561,127) $ 230,893,690 $ (209,701,928)
Change in unrealized gain (loss) on open futures contracts 46,252,567 (122,742,937) 18,286,173
Realized gain (loss) on short-term investments 93 (15,781) (1,172)
Dividend income 582,039 569,787 148,745
Interest income [1] 6,027,693 5,960,666 3,982,312
ETF transaction fees 120,000 194,000 277,000
Total income (loss) (73,578,735) 114,859,425 (187,008,870)
Expenses      
General Partner management fees (Note 3) 1,820,281 2,259,093 2,972,340
Professional fees 802,399 928,798 1,390,036
Brokerage commissions 1,155,153 1,424,713 1,728,440
Directors' fees and insurance 70,739 69,624 64,982
License fees 45,507 56,477 74,309
Registration fees 144,440 83,258 204,998
Total expenses 4,038,519 4,821,963 6,435,105
Net income (loss) $ (77,617,254) $ 110,037,462 $ (193,443,975)
Net income (loss) per limited partnership share $ (7.44) $ 1.01 $ (13.84) [2]
Net income (loss) per weighted average limited partnership share $ (5.39) $ 6.73 $ (10.54) [2]
Weighted average limited partnership shares outstanding 14,401,574 16,359,928 18,356,071 [2]
[1] Interest income does not exceed paid in kind of 5%.
[2] On January 4, 2018, there was a 1for4 reverse share split. The Statement of Operations have been adjusted for the period shown to reflect the 1for4 reverse share split on a retroactive basis.