Derivative Instruments and Hedging Activities (Trading Gains (Loss)) (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	$ (516,384)	$ 2,622,830	$ (1,887,323)	$ 744,288
Agriculture [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	16,161	(402,415)	(300,187)	(1,014,096)
Currency [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	(176,598)	(131,022)	(819,922)	(1,356,729)
Energy [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	(261,344)	(187,631)	(79,134)	8,390
Indices [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	(189,706)	1,125,206	(526,943)	1,391,291
Interest Rates [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	26,825	1,637,315	164,439	1,250,639
Metals [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Trading gain (loss)	$ 68,278	$ 581,377	$ (325,576)	$ 464,793

- Definition

The profit or loss resulting from the difference between the acquisition cost and the selling price or current market or fair value when a broker-dealer or other financial entity buys and sells securities exclusively for its own account, sometimes referred to as proprietary trading. The net gain (loss) includes both realized and unrealized from trading cash instruments, equities and derivative contracts (including commodity contracts) that has been recognized during the accounting period for the broker dealer or other financial entity's own account. Trading revenue may include: (1) Revaluation adjustments to the carrying value of cash instruments reported as Trading assets, and Trading liabilities, resulting from the periodic marking to market of such instruments. (2) Revaluation adjustments from the periodic marking to market of interest rate, foreign exchange, equity derivative, and commodity and other derivative contracts held for trading. (3) Incidental income and expense related to the purchase and sale of cash instruments reported as Trading assets, and Trading liabilities, and derivative contracts held for trading.

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