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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivatives not designated as hedging instruments:

As of June 30, 2016
                  
 
  
Asset
    
Liability
        
Type of
  
Derivatives
    
Derivatives
    
Net
  
Futures Contracts
  
Fair Value
    
Fair Value
    
Fair Value
  
 
                  
Agriculture
  
$
123,133
    
$
(56,269
)
  
$
66,864
  
Currency
    
87,826
      
(3,617
)
    
84,209
  
Energy
    
15,467
      
(47,392
)
    
(31,925
)
Indices
    
37,275
      
(13,844
)
    
23,431
  
Interest Rates
    
171,846
      
(1,248
)
    
170,598
  
Metals
    
59,045
      
(10,508
)
    
48,537
  
 
  
$
494,592
    
$
(132,878
)
  
$
361,714
  
As of December 31, 2015
                  
   
Asset
    
Liability
        
Type of
  
Derivatives
    
Derivatives
    
Net
  
Futures Contracts
  
Fair Value
    
Fair Value
    
Fair Value
  
                   
Agriculture
  
$
32,649
    
$
(61,049
)
  
$
(28,400
)
Currency
    
26,412
      
(863
)
    
25,549
  
Energy
    
104,889
      
(74,035
)
    
30,854
  
Indices
    
5,225
      
(23,774
)
    
(18,549
)
Interest rates
    
4,782
      
(21,653
)
    
(16,871
)
Metals
    
11,985
      
(9,213
)
    
2,772
  
   
$
185,942
    
$
(190,587
)
  
$
(4,645
)
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block] Trading gain (loss) for the following periods:

   
Six Months Ended June 30,
  
Type of Futures Contracts
  
2016
    
2015
  
Agriculture
  
$
134,516
    
$
(18,170
)
Currency
    
63,370
      
(298,355
)
Energy
    
(64,464
)
    
(54,835
)
Indices
    
(9,103
)
    
(19,455
)
Interest Rates
    
541,312
      
107,464
  
Metals
    
28,601
      
(155,242
)
   
$
694,232
    
$
(438,593
)
   
Three Months Ended June 30,
  
Type of Futures Contracts
  
2016
    
2015
  
Agriculture
  
$
163,133
    
$
(45,178
)
Currency
    
8,489
      
(276,525
)
Energy
    
(165,325
)
    
(54,979
)
Indices
    
(297,904
)
    
(258,412
)
Interest Rates
    
330,221
      
(245,948
)
Metals
    
17,432
      
(23,837
)
   
$
56,046
    
$
(904,879
)