Trust Agreement (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2017

Dec. 31, 2016

Trust Agreement [Abstract]

Schedule Of Brokerage Rates Based On Net Capital Investment Levels Or Investments In Asset-based Fee Or Fixed Fee Investment Programs

Net Capital Investments	Brokerage Fees
$100,000–$499,999	6.50	%
$500,000–$999,999	6.00
Greater than $1,000,000	5.50
Asset-based or fixed fee investment programs	4.00

Schedule Of Brokerage And Custodial Fees

	Three months ending June 30,		Six months ending June 30,
	2017	2016	2017	2016
Brokerage fees	$             3,158,867	$             3,211,829	$             6,409,193	$             6,512,152
Custodial fees	7	6	13	33
Total	$             3,158,874	$             3,211,835	$             6,409,206	$             6,512,185

	2016	2015	2014
Brokerage fees	$           13,188,941	$           13,566,607	$           15,803,101
Custodial fees	46	131	213
Total	$           13,188,987	$           13,566,738	$           15,803,314

Schedule Of Redemption Charges Based On Redeemed Units' Net Asset Value

	Redemption Charges
Subscriptions	First 6 Months		Second 5 Months
Less than $100,000	4.0	%	3.0	%
$100,000–$499,999	3.5		2.5
$500,000–$999,999	3.0		2.0
Greater than $1,000,000	2.5		1.5