Derivative Instruments (Schedule Of Fair Value Of Futures And Forward Currency Contracts) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	$ 3,927,042	$ (98,592)
Futures Contracts [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	2,281,706	1,097,472
Energies [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	876,755	312,136
Grains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	55,475	(187,779)
Interest Rates [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	604,490	394,563
Livestock [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	2,620	(140)
Metals [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	355,483	295,006
Softs [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	70,581	(3,723)
Stock Indices [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	316,302	287,409
Forward Currency Contracts [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,645,336	(1,196,064)
Long Positions [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	3,303,979	4,836,634
Long Positions [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(6,533,387)	(1,282,019)
Long Positions [Member] | Futures Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,373,170	1,395,531
Long Positions [Member] | Futures Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,794,247)	(734,129)
Long Positions [Member] | Energies [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value		340,590
Long Positions [Member] | Energies [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value		(106,604)
Long Positions [Member] | Grains [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	81,318	19,178
Long Positions [Member] | Grains [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(12,920)	(2,420)
Long Positions [Member] | Interest Rates [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	862,548	15,841
Long Positions [Member] | Interest Rates [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(258,058)	(74,086)
Long Positions [Member] | Livestock [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	3,750
Long Positions [Member] | Livestock [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,130)	(140)
Long Positions [Member] | Metals [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	129,545	643,619
Long Positions [Member] | Metals [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(1,493,292)	(256,322)
Long Positions [Member] | Softs [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	4,860	15,605
Long Positions [Member] | Softs [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(4,250)	(1,265)
Long Positions [Member] | Stock Indices [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	291,149	360,698
Long Positions [Member] | Stock Indices [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(24,597)	(293,292)
Long Positions [Member] | Forward Currency Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,930,809	3,441,103
Long Positions [Member] | Forward Currency Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(4,739,140)	(547,890)
Short Positions [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	9,451,619	1,694,565
Short Positions [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(2,295,169)	(5,347,772)
Short Positions [Member] | Futures Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	2,935,952	1,190,981
Short Positions [Member] | Futures Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(233,169)	(754,911)
Short Positions [Member] | Energies [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	931,892	79,540
Short Positions [Member] | Energies [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(55,137)	(1,390)
Short Positions [Member] | Grains [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	528	5,688
Short Positions [Member] | Grains [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(13,451)	(210,225)
Short Positions [Member] | Interest Rates [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value		562,011
Short Positions [Member] | Interest Rates [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value		(109,203)
Short Positions [Member] | Metals [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	1,821,042	286,283
Short Positions [Member] | Metals [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(101,812)	(378,574)
Short Positions [Member] | Softs [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	73,274	6,852
Short Positions [Member] | Softs [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(3,303)	(24,915)
Short Positions [Member] | Stock Indices [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	109,216	250,607
Short Positions [Member] | Stock Indices [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	(59,466)	(30,604)
Short Positions [Member] | Forward Currency Contracts [Member] | Gains [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	6,515,667	503,584
Short Positions [Member] | Forward Currency Contracts [Member] | Losses [Member]
Derivative [Line Items]
Futures and forward currency contracts, Fair Value	$ (2,062,000)	$ (4,592,861)