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FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Details) - $ / shares
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Per Share Operating Performance:    
Net asset value, beginning of period $ 9.72 $ 9.72
Total income (loss) 0.96 (0.81)
Net expenses (0.04) (0.06)
Net increase (decrease) in net asset value 0.92 (0.87)
Net asset value, end of period $ 10.64 $ 12.82
Total Return 9.47% (6.36%)
Ratios to Average Net Assets    
Total income (loss) 10.53% (3.57%)
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.91% 0.62%
Expenses waived [1] (0.76%) (0.47%)
Net expenses excluding management fees [1] 0.15% 0.15%
Net income (loss) 10.09% (4.01%)
[1] Annualized.