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Financial Highlights (Tables)
 12 Months Ended
Dec. 31, 2015
Financial Highlights [Abstract]  
Per Unit Performance Data and Other Supplemental Financial Data
The following table presents per share performance data and other supplemental financial data for the years ended December 31, 2015, 2014 and 2013. This information has been derived from information presented in the financial statements.
 
 
 
Year ended
December 31, 2015
 
 
Year ended
December 31, 2014
 
 
Year ended
December 31, 2013
 
Per Share Operating Performance:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net asset value, beginning of year
 
$
26.59
 
 
$
42.83
 
 
$
39.81
 
Total income (loss)
 
 
(9.41)
 
 
 
(15.85)
 
 
 
3.43
 
Net expenses
 
 
(0.18)
 
 
 
(0.39)
 
 
 
(0.41)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net increase (decrease) in net asset value
 
 
(9.59)
 
 
 
(16.24)
 
 
 
3.02
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net asset value, end of year
 
$
17.00
 
 
$
26.59
 
 
$
42.83
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Return
 
 
(36.07)
%
 
 
(37.92)
%
 
 
7.59
%
 
 
 
 
 
 
 
 
 
 
 
 
 
Ratios to Average Net Assets
 
 
 
 
 
 
 
 
 
 
 
 
Total income (loss)
 
 
(37.86)
%
 
 
(34.74)
%
 
 
7.54
%
Management fees
 
 
0.60
%
 
 
0.60
%
 
 
0.60
%
Expenses excluding management fees
 
 
0.20
%
 
 
0.33
%
 
 
0.39
%
Net income (loss)
 
 
(38.65)
%
 
 
(35.66)
%
 
 
6.55
%