Derivative Instruments and Hedging Activities (Derivatives Not Designated as Hedging Instruments) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Asset Derivatives Fair Value	$ 266,687	$ 992,885
Liability Derivatives Fair Value	(649,225)	(607,419)
Net Fair Value	(382,538)	385,466
Agriculture [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	970,188	10,408
Liability Derivatives Fair Value	958,839
Net Fair Value	11,349	10,408
Currency [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	31,309	527,500
Liability Derivatives Fair Value	47,372	(350,799)
Net Fair Value	(16,063)	176,701
Energy [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	143,943	225,038
Liability Derivatives Fair Value	122,350	(119,410)
Net Fair Value	21,593	105,628
Indices [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	25,788	17,851
Liability Derivatives Fair Value	28,565	(47,027)
Net Fair Value	(2,777)	(29,176)
Interest Rates [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	40,242	139,768
Liability Derivatives Fair Value	32,993	(10,045)
Net Fair Value	7,249	129,723
Metals [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	269,400	72,320
Liability Derivatives Fair Value	184,616	(80,138)
Net Fair Value	$ 84,784	$ (7,818)