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FINANCIAL HIGHLIGHTS (Tables)
 12 Months Ended
Dec. 31, 2018
Financial Highlights [Abstract]  
Per Unit Performance Data and Other Supplemental Financial Data
This information has been derived from information presented in the financial statements.
 
 
 
Year ended December

31, 2018
 
 
Year ended December

31, 2017
 
 
Year ended December

31, 2016
 
Per Share Operating Performance:
 
 
 
 
 
 
 
 
 
 
 
 
Net asset value, beginning of year
 
$
9.26
 
 
$
11.75
 
 
$
9.72
 
Total income (loss)
 
 
1.09
 
 
 
(2.40
)
 
 
2.12
 
Net expenses
 
 
(0.09
)
 
 
(0.09
)
 
 
(0.09
)
Net increase (decrease) in net asset value
 
 
1.00
 
 
 
(2.49
)
 
 
2.03
 
Net asset value, end of year
 
$
10.26
 
 
$
9.26
 
 
$
11.75
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Return
 
 
10.80
%
 
 
(21.19
)%
 
 
20.88
%
 
 
 
 
 
 
 
 
 
 
 
 
 
Ratios to Average Net Assets
 
 
 
 
 
 
 
 
 
 
 
 
Total income (loss)
 
 
9.73
%
 
 
(29.05
)%
 
 
21.94
%
Management fees
 
 
0.75
%
 
 
0.75
%
 
 
0.75
%
Total expenses excluding management fees*
 
 
1.08
%
 
 
0.74
%
 
 
0.90
%
Expenses waived
 
 
(0.93
)%
 
 
(0.59
)%
 
 
(0.75
)%
Net expenses excluding management fees
 
 
0.15
%
 
 
0.15
%
 
 
0.15
%
Net income (loss)
 
 
8.83
%
 
 
(29.95
)%
 
 
21.04
%