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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 and December 31, 2015, respectively:

   
September 30, 2016
  
   
Level 1
    
Level 2
    
Level 3
    
Total
  
Assets
                        
Net unrealized gain on open contracts:
                        
Futures positions
  
$
187,205
    
$
-
    
$
-
    
$
187,205
  
     
187,205
      
-
      
-
      
187,205
  
Liabilities
                                
Net unrealized loss on open contracts:
                                
Futures positions
    
(2,873
)
    
-
      
-
      
(2,873
)
Options written on futures contracts
    
(21,900
)
    
-
      
-
      
(21,900
)
     
(24,773
)
    
-
      
-
      
(24,773
)
                                 
Total fair value
  
$
162,432
    
$
-
    
$
-
    
$
162,432
  
   
December 31, 2015
  
   
Level 1
    
Level 2
    
Level 3
    
Total
  
Assets
                                
Net unrealized gain on open contracts:
                                
Futures positions
  
$
3,414
    
$
-
    
$
-
    
$
3,414
  
     
3,414
      
-
      
-
      
3,414
  
Liabilities
                                
Options written on futures contracts
    
(8,059
)
    
-
      
-
      
(8,059
)
     
(8,059
)
    
-
      
-
      
(8,059
)
                                 
Total fair value
  
$
(4,645
)
  
$
-
    
$
-
    
$
(4,645
)