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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 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 June 30, 2016 and December 31, 2015, respectively:

   
June 30, 2016
        
   
Level 1
    
Level 2
    
Level 3
    
Total
  
Assets
                        
Unrealized gain on open contracts:
                        
Futures positions
  
$
369,014
    
$
-
    
$
-
    
$
369,014
  
     
369,014
      
-
      
-
      
369,014
  
Liabilities
                                
Options written on futures contracts
    
(7,300
)
    
-
      
-
      
(7,300
)
     
(7,300
)
    
-
      
-
      
(7,300
)
                                 
Total fair value
  
$
361,714
    
$
-
    
$
-
    
$
361,714
  
   
December 31, 2015
        
   
Level 1
    
Level 2
    
Level 3
    
Total
  
Assets
                        
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
)