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Financial Highlights (Per Unit Performance Data and Other Supplemental Financial Data) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Per Share Operating Performance:
Net asset value, beginning of period	$ 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 period	$ 17	$ 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%