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Financial Highlights
6 Months Ended
Jun. 30, 2012
Financial Highlights [Abstract]  
Financial Highlights
2.  Financial Highlights
 
Financial Highlights for the three and six months ended June 30, 2012, and 2011 were as follows:
                                                                   
  For the Three Months Ended June 30,  For the Six Months Ended June 30, 
             
   
2012
  
2011
  
2012
  
2011
 
         Per Unit operating performance:
            
         Net asset value at the beginning of the period:
 $10.01  $9.99  $9.77  $10.59 
                  
                     Interest Income
  -(3)  -(3)  -(3)  -(3)
                     Expenses
  (0.21)  (0.21)  (0.41)  (0.42)
                     Realized/Unrealized Income (Loss) (1)
   0.18   0.10(4)  0.62    (0.29) (4)
                     Net Income (Loss)
  (0.03)  (0.11)  0.21   (0.71)
                  
         Net asset value, June 30:
 $9.98  $9.88  $9.98  $9.88 
                  
         Ratios to average net assets:
                
                     Net Investment Loss  (2)
  (8.2)%  (8.3)%  (8.2)%  (8.3)%
                     Expenses before Incentive Fees (2)
  8.3%  8.3%  8.2%  8.3%
                     Expenses after Incentive Fees (2)
  8.3%  8.3%  8.2%  8.3%
                     Net Income (Loss)  (2)
  (0.7)%  (2.5)%  5.0%  (13.5)%
         Total return before incentive fees
  (0.3)%  (1.1)%  2.1%  (6.7)%
         Total return after incentive fees
  (0.3)%  (1.1)%  2.1%  (6.7)%
 
(1)
 
Realized/Unrealized Income (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 Units.
 
(4)
 
These amounts have been reclassified from the prior year financial statements to conform to the current year presentation.  Specifically, realized and unrealized income (loss) per Unit amounts were combined in the 2011 Financial Highlights presentation.