Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Derivatives not designated as hedging instruments:

As of March 31, 2017
	Asset		Liability
Type of	Derivatives		Derivatives			Net
Futures Contracts	Fair Value		Fair Value			Fair Value
Agriculture	$	37,195	$	(2,400	)	$	34,795
Currency		9,512		(6,704	)		2,808
Energy		5,140		(111,076	)		(105,936	)
Indices		18,351		(3,780	)		14,571
Interest rates		8,778		-			8,778
Metals		3,455		(180	)		3,275
	$	82,431	$	(124,140	)	$	(41,709	)

Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]

Trading gain (loss) for the following periods:

	Three Months Ended March 31,
Type of Futures Contracts	2017			2016
Agriculture	$	6,807		$	(28,617	)
Currency		7,971			54,881
Energy		(150,031	)		100,861
Indices		376,710			288,800
Interest rates		(185,192	)		211,092
Metals		2,190			11,169
	$	58,455		$	638,186