Derivative Instruments and Hedging Activities (Details) - Trading Gains (Losses) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	$ (184,407)	$ (516,384)	$ (581,994)	$ (1,887,323)
Agriculture [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	448,716	16,161	264,053	(300,187)
Currency [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	(114,491)	(176,598)	(291,173)	(819,922)
Energy [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	(208,334)	(261,344)	(221,429)	(79,134)
Indices [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	(46,465)	(189,706)	(263,585)	(526,943)
Interest Rates [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	(96,551)	26,825	(120,876)	164,439
Metal [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	$ (167,282)	$ 68,278	$ 51,016	$ (325,576)