FINANCIAL HIGHLIGHTS (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Financial Information Disclosure [Abstract]

Schedule Of Per Unit Performance Data and Other Financial Data

The following table presents per share performance data and other supplemental financial data for the years ended December 31, 2018, 2017 and 2016 for the shareholders. 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	$	18.18		$	15.70		$	12.22
Total income (loss)		(2.82	)		2.61			3.60
Net expenses		(0.18	)		(0.13	)		(0.12	)
Net increase (decrease) in net asset value		(3.00	)		2.48			3.48
Net asset value, end of year	$	15.18		$	18.18		$	15.70

Total Return		(16.50	)%		15.80	%		28.48	%

Ratios to Average Net Assets
Total income (loss)		(14.88	)%		16.22	%		34.23	%
Management fees		0.75	%		0.75	%		0.75	%
Total expenses excluding management fees		0.23	%		0.48	%		0.32	%
Expenses waived		(0.08	)%		(0.33	)%		(0.17	)%
Net expenses excluding management fees		0.15	%		0.15	%		0.15	%
Net income (loss)		(15.78	)%		15.32	%		33.33	%