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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Per Share Operating Performance:      
Net asset value, beginning of year $ 12.22 $ 22.39 $ 43.81
Total income (loss) 3.60 (10.00) (21.06)
Net expenses (0.12) (0.17) (0.36)
Net increase (decrease) in Net Asset Value 3.48 (10.17) (21.42)
Net asset value, end of year $ 15.70 $ 12.22 $ 22.39
Total Return 28.48% (45.42%) (48.89%)
Ratios to Average Net Assets      
Total income (loss) 34.23% (46.52%) (68.25%)
Management fees 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.32% 0.30% 0.56%
Expenses waived (0.17%) (0.15%) (0.39%)
Net expenses excluding management fees 0.15% 0.15% 0.17%
Net income (loss) 33.33% (47.42%) (69.17%)