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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Per Share Operating Performance:    
Net asset value, beginning of period $ 12.22 $ 22.39
Total income (loss) 0.11 (1.86)
Net expenses (0.02) (0.05)
Net increase (decrease) in net asset value 0.09 (1.91)
Net asset value, end of period $ 12.31 $ 20.48
Total Return 0.74% (8.53%)
Ratios to Average Net Assets    
Total income (loss) 6.92% (2.95%)
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.40% 0.29%
Expenses waived [1] (0.25%) (0.13%)
Net expenses excluding management fees [1] 0.15% 0.16%
Net income (loss) 6.70% (3.17%)
[1] Annualized.