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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Per Share Operating Performance:    
Net asset value, beginning of period $ 22.39 $ 43.81
Total income (loss) 0.34 1.75
Net expenses (0.1) (0.21)
Net increase (decrease) in net asset value 0.24 1.54
Net asset value, end of period $ 22.63 $ 45.35
Total Return 1.07% 3.52%
Ratios to Average Net Assets    
Total income (loss) 9.84% 5.02%
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.27% 0.59%
Expenses waived [1] (0.12%) (0.35%)
Net expenses excluding management fees [1] 0.15% 0.24%
Net income (loss) 9.40% 4.53%
[1] Annualized.