Derivative Instruments (Schedule Of Trading Gains (Losses) Of Futures And Forward Currency Contracts) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	$ 3,534,159	$ 391,434	$ (22,478,174)	$ 2,957,100
Futures Contracts [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	2,860,045	713,399	(24,057,979)	4,957,944
Energies [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	(2,236,235)	(1,049,986)	4,989,304	(4,340,484)
Grains [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	280,667	903,414	819,571	1,324,165
Interest Rates [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	1,860,198	907,085	(634,748)	7,780,770
Livestock [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	(18,890)	215,360	265,120	210,410
Metals [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	(366,924)	65,420	(426,901)	(473,715)
Softs [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	(257,006)	(144,759)	(255,472)	(79,753)
Stock Indices [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	3,598,235	(183,135)	(28,814,853)	536,551
Forward Currency Contracts [Member]
Derivative [Line Items]
Trading gains (losses) of futures and forward currency contracts	$ 674,114	$ (321,965)	$ 1,579,805	$ (2,000,844)