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Operations (Tables)
 12 Months Ended
Dec. 31, 2016
Brokers and Dealers [Abstract]  
Schedule of Due to (from) Broker-Dealers and Clearing Organizations [Table Text Block]
“Commission and fees” included the following across each class of units (1):

Recipient
  
Nature of Payment
  
Class A Units
    
Class B Units
    
Class C Units
    
Class D Units (2)
  
Managing Owner
  
Managing Owner Fee
    
0.50
%
    
0.50
%
    
0.50
%
    
0.50
%
Selling Agents
  
Selling Commission
    
2.00
%
    
0.00
%
    
0.00
%
    
2.00
%
Selling Agents
  
Selling Commission (initial sales charge) (3)
    
0.00
%
    
0.00
%
    
0.00
%
    
2.00
%
Managing Owner
  
Wholesale Fee (4)
    
0.00
%
    
0.00
%
    
0.35
%
    
0.35
%
Clearing Broker
  
Clearing, NFA and exchange fees (approximately) (5)
    
1.75
%
    
1.75
%
    
1.75
%
    
1.75
%
                                     
         
4.25
%
    
2.25
%
    
2.60
%
    
6.60
%