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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 $ (608,115) $ (479,014) $ (11,739)
Change in unrealized gain (loss) on open commodity futures contracts 413,714 (389,575) 522,819
Dividend income 2,604 11,525 24,807
Interest income [1] 18,621 81,092 86,283
ETF transaction fees 1,400 700 2,800
Total Income (Loss) (171,776) (775,272) 624,970
Expenses      
General Partner management fees (Note 3) 35,924 32,545 48,189
Professional fees 62,653 77,834 65,849
Brokerage commissions 1,633 1,231 1,334
Directors' fees and insurance 2,711 1,096 1,447
License fees 718 651 964
Total Expenses 103,639 113,357 117,783
Expense waiver (60,535) (74,303) (59,956)
Net Expenses 43,104 39,054 57,827
Net Income (Loss) $ (214,880) $ (814,326) $ 567,143
Net Income (Loss) per limited partner share $ (0.69) $ (1.83) $ 1.00
Net Income (Loss) per weighted average limited partner share $ (0.37) $ (1.80) $ 0.84
Weighted average limited partner shares outstanding 587,397 452,329 671,507
[1] Interest income does not exceed paid in kind of 5%.