Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000046619-22-000024-index-headers.html | 2022-04-12 14:46:05 | |
| 0000046619-22-000024-index.html | 2022-04-12 14:46:05 | |
| 0000046619-22-000024.txt | 2022-04-12 14:46:05 | |
 0000046619-22-000024-xbrl.zip | 187331 | 2022-04-12 14:46:05 |
| a04072022ex101creditagreem.htm | 1576570 | 2022-04-12 14:46:05 |
| FilingSummary.xml | 2358 | 2022-04-12 14:46:05 |
| Financial_Report.xlsx | 6408 | 2022-04-12 14:46:05 |
| hei-20220407.htm | 42177 | 2022-04-12 14:46:05 |
| hei-20220407.xsd | 3301 | 2022-04-12 14:46:05 |
| hei-20220407_def.xml | 19682 | 2022-04-12 14:46:05 |
| hei-20220407_htm.xml | 14193 | 2022-04-12 14:46:05 |
| hei-20220407_lab.xml | 36278 | 2022-04-12 14:46:05 |
| hei-20220407_pre.xml | 19992 | 2022-04-12 14:46:05 |
| MetaLinks.json | 26338 | 2022-04-12 14:46:05 |
| R1.htm | 14775 | 2022-04-12 14:46:05 |
| R2.htm | 30792 | 2022-04-12 14:46:05 |
| report.css | 2767 | 2022-04-12 14:46:05 |
| Show.js | 1085 | 2022-04-12 14:46:05 |