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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (57,654) $ 368,482 $ (424,071) $ 656,563
Change in unrealized gain (loss) on open futures contracts 175,824 (923,902) 583,201 (3,109,473)
Dividend income 5,381 6,656 12,895 12,351
Interest income [1] 20,224 11,987 38,819 22,620
ETF transaction fees 350 350 1,400 1,400
Total income (loss) 144,125 (536,427) 212,244 (2,416,539)
Expenses        
General Partner management fees (Note 3) 11,705 19,500 26,076 44,888
Professional fees 16,582 12,259 36,246 31,011
Brokerage commissions 467 663 785 1,097
Directors' fees and insurance 338 494 753 932
License fees 234 390 521 898
Total expenses 29,326 33,306 64,381 78,826
Expense waiver (Note 3) (15,329) (9,907) (33,091) (24,960)
Net expenses 13,997 23,399 31,290 53,866
Net income (loss) $ 130,128 $ (559,826) $ 180,954 $ (2,470,405)
Net income (loss) per limited partnership share $ 0.20 $ (0.63) $ 0.23 $ (1.73)
Net income (loss) per weighted average limited partnership share $ 0.19 $ (0.57) $ 0.24 $ (2.17)
Weighted average limited partnership shares outstanding 670,879 987,912 753,591 1,139,227
[1] Interest income does not exceed paid in kind of 5%.