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Financial Highlights
 12 Months Ended
Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]  
Additional Financial Information Disclosure [Text Block]
(9)    Financial Highlights

The following financial highlights show the Trust’s financial performance of the Trading units for the periods ended December 31, 2014, 2013 or 2012.  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.

   
Class A
   
Class B
 
   
2014
   
2013
   
2012
   
2014
   
2013
   
2012
 
Per share operating performance:
                                   
    Net asset value of Trading units, beginning of period
  $ 71.25     $ 76.92     $ 91.32     $ 78.74     $ 83.34     $ 96.98  
    Total Trading income (loss):
                                               
         Trading gain (loss)
    5.31       1.37       (7.26 )     6.08       1.53       (7.78 )
         Investment income
    0.04       0.20       0.39       0.04       0.22       0.42  
         Expenses
    (9.11 )     (7.24 )     (7.53 )     (8.75 )     (6.35 )     (6.28 )
    Trading income (loss)
    (3.76 )     (5.67 )     (14.40 )     (2.63 )     (4.60 )     (13.64 )
    Net asset value of Trading units, end of period
  $ 67.49     $ 71.25     $ 76.92     $ 76.11     $ 78.74     $ 83.34  
                                                 
Total return:
                                               
    Total return before incentive fees
    (3.28 %)     (6.72 %)     (15.66 %)     (1.94 %)     (4.79 %)     (13.95 %)
    Less incentive fee allocations
    (1.99 %)     (0.66 %)     (0.11 %)     (1.41 %)     (0.73 %)     (0.11 %)
Total return
    (5.27 %)     (7.38 %)     (15.77 %)     (3.35 %)     (5.52 %)     (14.06 %)
                                                 
Ratios to average net assets:
                                               
    Trading income (loss)
    (9.26 %)     (8.61 %)     (17.28 %)     (15.76 %)     (5.78 %)     (15.40 %)
    Expenses:
                                               
         Expenses, less incentive fees
    (12.34 %)     (9.30 %)     (9.15 %)     (10.67 %)     (7.33 %)     (7.19 %)
         Incentive fees
    (1.99 %)     (0.66 %)     (0.11 %)     (1.41 %)     (0.73 %)     (0.11 %)
    Total expenses
    (14.33 %)     (9.96 %)     (9.26 %)     (12.08 %)     (8.06 %)     (7.30 %)

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 periods ended December 31, 2014, 2013 and 2012.  The amounts are not annualized.