Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the Trust’s fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis as of December 31, 2015 and 2014, respectively:

	December 31, 2015
	Level 1			Level 2		Level 3		Total
Assets
Unrealized gain on open contracts:
Futures positions	$	3,414		$	-	$	-	$	3,414
		3,414			-		-		3,414
Liabilities
Options written on futures contracts		(8,059	)		-		-		(8,059	)
		(8,059	)		-		-		(8,059	)
Total fair value	$	(4,645	)	$	-	$	-	$	(4,645	)

	December 31, 2014
	Level 1			Level 2			Level 3		Total
Assets
Unrealized gain (loss) on open contracts:
Futures positions	$	492,477		$	-		$	-	$	492,477
Forwards currency positions		-			(10,546	)		-		(10,546	)
		492,477			(10,546	)		-		481,931
Liabilities
Options written on futures contracts		(15,976	)		-			-		(15,976	)
		(15,976	)		-			-		(15,976	)
Total fair value	$	476,501		$	(10,546	)	$	-	$	465,955