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Financial Heights
6 Months Ended
Jun. 30, 2011
Financial Heights [Abstract]  
Financial Heights
2.  
Financial Highlights
Changes in the net asset value per Unit for the three and six months ended June 30, 2011 and 2010 were as follows:
                                                                           For the Three                                                                 For the Six
                                                                Months Ended June 30,                                                  Months Ended June 30,

 
2011                      
2010
2011
2010
         Per Unit operating performance:
       
         Net asset value at the beginning of the period:
$       9.99
$       9.34
$      10.59
$       9.79
         
                     Interest Income
  –   (3)
  –   (3)
  –   (3)
  –   (3)
                     Expenses
       (0.21)
       (0.20)
       (0.42)
       (0.41)
                     Realized Gain (Loss) (1)
        0.27
        0.28
        0.25
       (0.31)
                     Unrealized Gain (Loss)
       (0.17)
       (0.22)
       (0.54)
        0.13
                     Net Loss
       (0.11)
       (0.14)
       (0.71)
       (0.59)
         
         Net asset value, June 30:
 $     9.88
 $     9.20
 $     9.88
 $     9.20
         
         Ratios to average net assets:
       
                     Net Investment Loss  (2)
      (8.3)%
      (8.8)%
      (8.3)%
      (8.9)%
                     Expenses before Incentive Fees (2)
8.3%                       
8.9%                          
8.3%                          
       9.0 %
                     Expenses after Incentive Fees (2)
8.3%                       
8.9%                          
8.3%                          
       9.0 %
                     Net Loss  (2)
      (2.5)%
      (5.9)%
    (13.5)%
    (13.7)%
         Total return before incentive fees
      (1.1)%
      (1.5)%
      (6.7)%
      (6.0)%
         Total return after incentive fees
      (1.1)%
      (1.5)%
      (6.7)%
      (6.0)%


   (1) Realized Gain (Loss) is a balancing amount necessary to reconcile the change in net asset value per Unit
       with the other per Unit information.
   (2) Annualized (except for incentive fees, if applicable).

   (3) Amounts less than $0.005 per Unit.