XML 18 R32.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Per Share Operating Performance:      
Net asset value, beginning of year $ 9.59 $ 12.08 $ 11.71
Total income (loss) 3.28 (2.39) 0.45
Total expenses (0.09) (0.10) (0.08)
Net increase (decrease) in net asset value 3.19 (2.49) 0.37
Net asset value, end of year $ 12.78 $ 9.59 $ 12.08
Total Return 33.26% (20.61%) 3.16%
Ratios to Average Net Assets      
Total income (loss) 33.77% (15.36%) 3.75%
Management fees 0.45% 0.45% 0.45%
Expenses excluding management fees 0.34% 0.28% 0.31%
Net income (loss) 32.97% (16.09%) 2.99%