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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
As of December 31, 2016, the Trust held no assets or liabilities measured at fair value. 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 December 31, 2015:

   
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
)