Derivative Instruments (Schedule Of Fair Value Of Futures And Forward Currency Contracts) (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	$ 662,497	$ (98,592)
Futures Contracts [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	854,982	1,097,472
Energies [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(6,728)	312,136
Grains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	129,266	(187,779)
Interest Rates [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	822,460	394,563
Livestock [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,260)	(140)
Metals [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(449,560)	295,006
Softs [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(27,199)	(3,723)
Stock Indices [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	388,003	287,409
Forward Currency Contracts [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(192,485)	(1,196,064)
Long Positions [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	2,664,087	4,836,634
Long Positions [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,830,671)	(1,282,019)
Long Positions [Member] | Futures Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,984,629	1,395,531
Long Positions [Member] | Futures Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(166,878)	(734,129)
Long Positions [Member] | Energies [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	76,722	340,590
Long Positions [Member] | Energies [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(27,070)	(106,604)
Long Positions [Member] | Grains [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	168,350	19,178
Long Positions [Member] | Grains [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,650)	(2,420)
Long Positions [Member] | Interest Rates [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	878,747	15,841
Long Positions [Member] | Interest Rates [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(57,224)	(74,086)
Long Positions [Member] | Livestock [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	820
Long Positions [Member] | Livestock [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,730)	(140)
Long Positions [Member] | Metals [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	539,751	643,619
Long Positions [Member] | Metals [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(21,621)	(256,322)
Long Positions [Member] | Softs [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	6,919	15,605
Long Positions [Member] | Softs [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(28,030)	(1,265)
Long Positions [Member] | Stock Indices [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	313,320	360,698
Long Positions [Member] | Stock Indices [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(29,553)	(293,292)
Long Positions [Member] | Forward Currency Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	679,458	3,441,103
Long Positions [Member] | Forward Currency Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,663,793)	(547,890)
Short Positions [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,533,066	1,694,565
Short Positions [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,703,985)	(5,347,772)
Short Positions [Member] | Futures Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	174,493	1,190,981
Short Positions [Member] | Futures Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,137,262)	(754,911)
Short Positions [Member] | Energies [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	42,300	79,540
Short Positions [Member] | Energies [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(98,680)	(1,390)
Short Positions [Member] | Grains [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,157	5,688
Short Positions [Member] | Grains [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(38,591)	(210,225)
Short Positions [Member] | Interest Rates [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,222	562,011
Short Positions [Member] | Interest Rates [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(285)	(109,203)
Short Positions [Member] | Livestock [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(350)
Short Positions [Member] | Metals [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	2,820	286,283
Short Positions [Member] | Metals [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(970,510)	(378,574)
Short Positions [Member] | Softs [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value		6,852
Short Positions [Member] | Softs [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(6,088)	(24,915)
Short Positions [Member] | Stock Indices [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	126,994	250,607
Short Positions [Member] | Stock Indices [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(22,758)	(30,604)
Short Positions [Member] | Forward Currency Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,358,573	503,584
Short Positions [Member] | Forward Currency Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	$ (566,723)	$ (4,592,861)