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FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Details) - $ / shares
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Per Share Operating Performance:    
Net asset value, beginning of period $ 9.72 $ 9.72
Total income (loss) 0.48 (2.32)
Net expenses (0.06) (0.09)
Net decrease in net asset value 0.42 (2.41)
Net asset value, end of period $ 10.14 $ 11.28
Total Return 4.32% (17.60%)
Ratios to Average Net Assets    
Total income (loss) 4.93% (14.87%)
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.93% 0.66%
Expenses waived [1] (0.78%) (0.51%)
Net expenses excluding management fees [1] 0.15% 0.15%
Net income (loss) 4.26% (15.55%)
[1] Annualized.