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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2017:

   
March 31, 2017
        
   
Level 1
    
Level 2
    
Level 3
    
Total
  
Assets
                        
Net unrealized gain on open contracts:
                        
Futures positions
  
$
56,610
    
$
-
    
$
-
    
$
56,610
  
     
56,610
      
-
      
-
      
56,610
  
Liabilities
                                
Net unrealized loss on open contracts:
                                
Futures positions
    
(98,319
)
    
-
      
-
      
(98,319
)
     
(98,319
)
    
-
      
-
      
(98,319
)
                                 
Total fair value
  
$
(41,709
)
  
$
-
    
$
-
    
$
(41,709
)