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|---|---|---|
 0001193125-19-316421-index-headers.html | 2019-12-17 18:12:27 | |
| 0001193125-19-316421-index.html | 2019-12-17 18:12:27 | |
| 0001193125-19-316421.txt | 2019-12-17 18:12:27 | |
 0001193125-19-316421-xbrl.zip | 41012 | 2019-12-17 18:12:27 |
 BarChart1.png | 30341 | 2019-12-17 18:12:27 |
| d813902d497.htm | 5164 | 2019-12-17 18:12:27 |
| FilingSummary.xml | 3630 | 2019-12-17 18:12:27 |
 g813902g76y46.jpg | 11671 | 2019-12-17 18:12:27 |
| ist1-20191204.xml | 48152 | 2019-12-17 18:12:27 |
| ist1-20191204.xsd | 8108 | 2019-12-17 18:12:27 |
| ist1-20191204_cal.xml | 4736 | 2019-12-17 18:12:27 |
| ist1-20191204_def.xml | 208531 | 2019-12-17 18:12:27 |
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| R1.htm | 18247 | 2019-12-17 18:12:27 |
| R2.htm | 98042 | 2019-12-17 18:12:27 |
| R7.htm | 178173 | 2019-12-17 18:12:27 |
| R8.htm | 7481 | 2019-12-17 18:12:27 |
| report.css | 2767 | 2019-12-17 18:12:27 |
| Show.js | 1085 | 2019-12-17 18:12:27 |