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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] 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 September 30, 2013 and December 31, 2012, respectively:

   
September 30, 2013
       
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets
                       
Unrealized loss on open contracts:
                       
Futures positions
  $ (23,065 )     -       -     $ (23,065 )
Fixed income securities
    -       10,300,134       -       10,300,134  
Total fair value
  $ (23,065 )   $ 10,300,134       -     $ 10,277,069  
   
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