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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 $ (5,665,084) $ 20,594,140 $ 7,967,768
Change in unrealized gain (loss) on open futures contracts 19,374,784 (26,844,760) (6,205,208)
Realized gain (loss) on short-term investments 0 (21) 0
Dividend income 241,099 212,708 192,015
Interest income [1] 976,513 1,173,556 685,895
ETF transaction fees 4,550 5,950 11,200
Total income (loss) 14,931,862 (4,858,427) 2,651,670
Expenses      
General Partner management fees (Note 3) 337,314 473,218 646,339
Professional fees 131,501 144,701 235,201
Brokerage commissions 7,261 6,045 17,897
Directors' fees and insurance 13,028 13,806 14,120
License fees 8,433 11,830 16,158
Total expenses 497,537 649,600 929,715
Net income (loss) $ 14,434,325 $ (5,508,027) $ 1,721,955
Net income (loss) per limited partnership share $ 5.13 $ (3.23) $ 0.66
Net income (loss) per weighted average limited partnership share $ 5.52 $ (1.62) $ 0.29
Weighted average limited partnership shares outstanding 2,615,479 3,390,137 5,871,781
[1] Interest income does not exceed paid in kind of 5%