XML 42 R27.htm IDEA: XBRL DOCUMENT v3.10.0.1
FINANCIAL HIGHLIGHTS (Details) - $ / shares
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Per Share Operating Performance:    
Net asset value, beginning of period $ 18.18 $ 15.70
Total income (loss) 5.24 (0.41)
Net expenses (0.14) (0.10)
Net increase (decrease) in net asset value 5.10 (0.51)
Net asset value, end of period $ 23.28 $ 15.19
Total Return 28.05% (3.25%)
Ratios to Average Net Assets    
Total income (loss) 24.86% (1.30%)
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.26% 0.48%
Expenses waived [1] (0.11%) (0.33%)
Net expenses excluding management fees [1] 0.15% 0.15%
Net income (loss) 24.18% (1.97%)
[1] Annualized.