XML 42 R27.htm IDEA: XBRL DOCUMENT v3.8.0.1
FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Per Share Operating Performance:    
Net asset value, beginning of period $ 18.18 $ 15.7
Total income (loss) 0.99 (1.17)
Net expenses (0.04) (0.03)
Net increase (decrease) in net asset value 0.95 (1.2)
Net asset value, end of period $ 19.13 $ 14.5
Total Return 5.23% (7.64%)
Ratios to Average Net Assets    
Total income (loss) 5.04% (7.73%)
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.40% 0.60%
Expenses waived [1] (0.25%) (0.45%)
Net expenses excluding management fees [1] 0.15% 0.15%
Net income (loss) 4.82% (7.95%)
[1] Annualized.