Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000046619-21-000025-index-headers.html | 2021-03-24 16:41:39 | |
| 0000046619-21-000025-index.html | 2021-03-24 16:41:39 | |
| 0000046619-21-000025.txt | 2021-03-24 16:41:39 | |
 0000046619-21-000025-xbrl.zip | 18448 | 2021-03-24 16:41:39 |
| a2021ex101amendmenttoleade.htm | 17043 | 2021-03-24 16:41:39 |
| FilingSummary.xml | 2410 | 2021-03-24 16:41:39 |
| Financial_Report.xlsx | 6406 | 2021-03-24 16:41:39 |
| hei-20210319.htm | 39812 | 2021-03-24 16:41:39 |
| hei-20210319.xsd | 3516 | 2021-03-24 16:41:39 |
| hei-20210319_cal.xml | 1092 | 2021-03-24 16:41:39 |
| hei-20210319_def.xml | 14037 | 2021-03-24 16:41:39 |
| hei-20210319_htm.xml | 13245 | 2021-03-24 16:41:39 |
| hei-20210319_lab.xml | 32295 | 2021-03-24 16:41:39 |
| hei-20210319_pre.xml | 17703 | 2021-03-24 16:41:39 |
| MetaLinks.json | 24292 | 2021-03-24 16:41:39 |
| R1.htm | 14505 | 2021-03-24 16:41:39 |
| R2.htm | 30700 | 2021-03-24 16:41:39 |
| report.css | 2767 | 2021-03-24 16:41:39 |
| Show.js | 1085 | 2021-03-24 16:41:39 |