FINANCIAL HIGHLIGHTS (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016, 2015 and 2014. This information has been derived from information presented in the financial statements.

	Year ended			Year ended			Year ended
	December 31, 2016			December 31, 2015			December 31, 2014
Per Share Operating Performance:
Net asset value, beginning of year	$	12.22		$	22.39		$	43.81
Total income (loss)		3.60			(10.00)			(21.06)
Net expenses		(0.12)			(0.17)			(0.36)
Net increase (decrease) in Net Asset Value		3.48			(10.17)			(21.42)
Net asset value, end of year	$	15.70		$	12.22		$	22.39

Total Return		28.48	%		(45.42)	%		(48.89)	%

Ratios to Average Net Assets
Total income (loss)		34.23	%		(46.52)	%		(68.25)	%
Management fees		0.75	%		0.75	%		0.75	%
Total expenses excluding management fees		0.32	%		0.30	%		0.56	%
Expenses waived		(0.17)	%		(0.15)	%		(0.39)	%
Net expenses excluding management fees		0.15	%		0.15	%		0.17	%
Net income (loss)		33.33	%		(47.42)	%		(69.17)	%