Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000046619-20-000013-index-headers.html | 2020-04-15 16:40:40 | |
| 0000046619-20-000013-index.html | 2020-04-15 16:40:40 | |
| 0000046619-20-000013.txt | 2020-04-15 16:40:40 | |
 0000046619-20-000013-xbrl.zip | 22353 | 2020-04-15 16:40:40 |
| exhibit991covid-19impa.htm | 18537 | 2020-04-15 16:40:40 |
| FilingSummary.xml | 2442 | 2020-04-15 16:40:40 |
| Financial_Report.xlsx | 6497 | 2020-04-15 16:40:40 |
| form8-kcovidx19impact.htm | 68538 | 2020-04-15 16:40:40 |
| form8-kcovidx19impact_htm.xml | 6435 | 2020-04-15 16:40:40 |
| hei-20200415.xsd | 5245 | 2020-04-15 16:40:40 |
| hei-20200415_cal.xml | 992 | 2020-04-15 16:40:40 |
| hei-20200415_def.xml | 6433 | 2020-04-15 16:40:40 |
| hei-20200415_lab.xml | 32970 | 2020-04-15 16:40:40 |
| hei-20200415_pre.xml | 17382 | 2020-04-15 16:40:40 |
| MetaLinks.json | 23226 | 2020-04-15 16:40:40 |
| R1.htm | 14500 | 2020-04-15 16:40:40 |
| R2.htm | 32160 | 2020-04-15 16:40:40 |
| report.css | 2767 | 2020-04-15 16:40:40 |
| Show.js | 1085 | 2020-04-15 16:40:40 |