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Financial Highlights
 3 Months Ended
Mar. 31, 2017
Disclosure Text Block Supplement [Abstract]  
Additional Financial Information Disclosure [Text Block]
(8)         Financial Highlights

The following financial highlights show the Trust’s financial performance of the Trading units by class for the three month periods ended March 31, 2017, and 2016, respectively.  Total return is calculated as the change in a theoretical beneficial owner’s investment over the entire period, and is not annualized.  Total return is calculated based on the aggregate return of the Trust’s Trading units taken as a whole.  No financial highlights per share operating performance has been presented for Class C units for the three month periods ended March 31, 2017 and 2016, respectively, since all Class C units were purchased and fully redeemed in January 2015 and no further Class C units have been issued subsequently.  As of March 31, 2017, no Class D units had been sold and, therefore, the Trust’s financial performance with respect to the class D units is not reflected below.

   
Class A
    
Class B
  
   
Three months ended
    
Three months ended
  
   
March 31,
    
March 31,
  
   
2017
    
2016
    
2017
    
2016
  
Per share operating performance:
                        
    Net asset value of Trading units, beginning of period
  
$
49.35
    
$
58.09
    
$
57.94
    
$
66.84
  
    Total Trading income (loss):
                                
         Trading gain (loss)
    
0.79
      
5.63
      
0.93
      
6.48
  
         Investment income
    
0.03
      
0.03
      
0.03
      
0.04
  
         Expenses
    
(1.61
)
    
(2.23
)
    
(1.60
)
    
(2.22
)
    Trading income (loss)
    
(0.79
)
    
3.43
      
(0.64
)
    
4.30
  
    Net asset value of Trading units, end of period
  
$
48.56
    
$
61.52
    
$
57.30
    
$
71.14
  
                                 
Total return:
                                
    Total return before incentive fees
    
(1.60
%)
    
6.46
%
    
(1.11
%)
    
6.98
%
    Less incentive fee allocations
    
0.00
%
    
(0.56
%)
    
0.00
%
    
(0.55
%)
Total return
    
(1.60
%)
    
5.90
%
    
(1.11
%)
    
6.43
%
                                 
Ratios to average net assets:
                                
    Trading income (loss)
    
(1.62
%)
    
5.71
%
    
(2.10
%)
    
6.13
%
    Expenses:
                                
         Expenses, less incentive fees
    
(3.32
%)
    
(3.13
%)
    
(3.17
%)
    
(2.60
%)
         Incentive fees
    
0.00
%
    
(0.56
%)
    
0.00
%
    
(0.55
%)
    Total expenses
    
(3.32
%)
    
(3.69
%)
    
(3.17
%)
    
(3.15
%)

The calculations above do not include activity within the Trust’s Non-Trading Accounts.

The net income and expense ratios are computed based upon the weighted average net assets for the Trust for the three month periods ended March 31, 2017 and 2016, respectively.  The amounts are not annualized.  Total return is calculated for each class of unitholders’ capital taken as a whole.  An individual investor’s return may vary from these returns.