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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Measurements [Abstract]  
Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents the Trust's fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis as of March 31, 2013 and year ended December 31, 2012, respectively:

 

    March 31, 2013        
    Level 1     Level 2     Level 3     Total  
Assets                                
Unrealized gain on open contracts:                                
Futures positions   $ 68,980     $ -     $ -     $ 68,980  
Investment in Global Diversified Managed Futures Portfolio LLC     704,958       -       -       704,958  
Purchased options on futures contracts     2,241,647       -       -       2,241,647  
Fixed income securities     -       10,771,369       -       10,771,369  
Total assets     3,015,585       10,771,369       -       13,786,954  
                                 
Liabilities                                
Options written on futures contracts     2,250,804       -       -       2,250,804  
Total fair value   $ 764,781     $ 10,771,369     $ -     $ 11,536,150  

 

    December 31, 2012        
    Level 1     Level 2     Level 3     Total  
Assets                                
Unrealized gain on open contracts:                                
Futures positions   $ 260,744     $ -     $ -     $ 260,744  
Purchased options on futures contracts     728,440       -       -       728,440  
Fixed income securities     -       11,003,681       -       11,003,681  
Total assets     989,184       11,003,681       -       11,992,865  
                                 
Liabilities                                
Options written on futures contracts     884,242       -       -       884,242  
Total fair value   $ 104,942     $ 11,003,681     $ -     $ 11,108,623