Derivative Instruments (Schedule Of Fair Value Of Futures And Forward Currency Contracts) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	$ 1,757,152	$ (98,592)
Futures Contracts [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	989,817	1,097,472
Energies [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	35,320	312,136
Grains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	19,199	(187,779)
Interest Rates [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	683,654	394,563
Livestock [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(2,650)	(140)
Metals [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	31,057	295,006
Softs [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	33,266	(3,723)
Stock Indices [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	189,971	287,409
Forward Currency Contracts [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	767,335	(1,196,064)
Long Positions [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	3,126,080	4,836,634
Long Positions [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(3,245,978)	(1,282,019)
Long Positions [Member] | Futures Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,796,738	1,395,531
Long Positions [Member] | Futures Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(735,111)	(734,129)
Long Positions [Member] | Energies [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	12,007	340,590
Long Positions [Member] | Energies [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(5,210)	(106,604)
Long Positions [Member] | Grains [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	207,685	19,178
Long Positions [Member] | Grains [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(12,785)	(2,420)
Long Positions [Member] | Interest Rates [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	904,356	15,841
Long Positions [Member] | Interest Rates [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(219,732)	(74,086)
Long Positions [Member] | Livestock [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	5,310
Long Positions [Member] | Livestock [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value		(140)
Long Positions [Member] | Metals [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	259,152	643,619
Long Positions [Member] | Metals [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(262,251)	(256,322)
Long Positions [Member] | Softs [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	24,227	15,605
Long Positions [Member] | Softs [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(5,291)	(1,265)
Long Positions [Member] | Stock Indices [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	384,001	360,698
Long Positions [Member] | Stock Indices [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(229,842)	(293,292)
Long Positions [Member] | Forward Currency Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,329,342	3,441,103
Long Positions [Member] | Forward Currency Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(2,510,867)	(547,890)
Short Positions [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	3,514,592	1,694,565
Short Positions [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,637,542)	(5,347,772)
Short Positions [Member] | Futures Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	277,723	1,190,981
Short Positions [Member] | Futures Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(349,533)	(754,911)
Short Positions [Member] | Energies [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	52,520	79,540
Short Positions [Member] | Energies [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(23,997)	(1,390)
Short Positions [Member] | Grains [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	3,762	5,688
Short Positions [Member] | Grains [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(179,463)	(210,225)
Short Positions [Member] | Interest Rates [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	725	562,011
Short Positions [Member] | Interest Rates [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,695)	(109,203)
Short Positions [Member] | Livestock [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,580
Short Positions [Member] | Livestock [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(9,540)
Short Positions [Member] | Metals [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	157,360	286,283
Short Positions [Member] | Metals [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(123,204)	(378,574)
Short Positions [Member] | Softs [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	14,450	6,852
Short Positions [Member] | Softs [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(120)	(24,915)
Short Positions [Member] | Stock Indices [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	47,326	250,607
Short Positions [Member] | Stock Indices [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(11,514)	(30,604)
Short Positions [Member] | Forward Currency Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	3,236,869	503,584
Short Positions [Member] | Forward Currency Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	$ (1,288,009)	$ (4,592,861)