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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2017
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 June 30, 2017:

   
June 30, 2017
       
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets
                       
Net unrealized gain on open contracts:
                       
Futures positions
 
$
62,092
   
$
-
   
$
-
   
$
62,092
 
     
62,092
     
-
     
-
     
62,092
 
Liabilities
                               
Net unrealized loss on open contracts:
                               
Futures positions
   
(73,575
)
   
-
     
-
     
(73,575
)
     
(73,575
)
   
-
     
-
     
(73,575
)
                                 
Total fair value
 
$
(11,483
)
 
$
-
   
$
-
   
$
(11,483
)