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FINANCIAL HIGHLIGHTS (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014. This information has been derived from information presented in the financial statements.
 
 
 
Year ended
 
 
Year ended
 
 
Year ended
 
 
 
December 31,
 
 
December 31,
 
 
December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Per Share Operating Performance:
 
 
 
 
 
 
 
 
 
 
 
 
Net asset value, beginning of year
 
$
11.02
 
 
$
20.15
 
 
$
35.23
 
Total income (loss)
 
 
0.77
 
 
 
(9.01)
 
 
 
(14.85)
 
Total expenses
 
 
(0.08)
 
 
 
(0.12)
 
 
 
(0.23)
 
Net increase (decrease) in net asset value
 
 
0.69
 
 
 
(9.13)
 
 
 
(15.08)
 
Net asset value, end of year
 
$
11.71
 
 
$
11.02
 
 
$
20.15
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Return
 
 
6.26
%
 
 
(45.31)
%
 
 
(42.80)
%
 
 
 
 
 
 
 
 
 
 
 
 
 
Ratios to Average Net Assets
 
 
 
 
 
 
 
 
 
 
 
 
Total income (loss)
 
 
20.57
%
 
 
(49.08)
%
 
 
(68.15)
%
Expenses excluding management fees
 
 
0.32
%
 
 
0.29
%
 
 
0.27
%
Management fees
 
 
0.45
%
 
 
0.45
%
 
 
0.45
%
Net income (loss)
 
 
19.80
%
 
 
(49.82)
%
 
 
(68.86)
%