Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-21-000030-index-headers.html | 2021-05-18 19:50:41 | |
| 0000799233-21-000030-index.html | 2021-05-18 19:50:41 | |
| 0000799233-21-000030.txt | 2021-05-18 19:50:41 | |
 0000799233-21-000030-xbrl.zip | 10832 | 2021-05-18 19:50:41 |
| FilingSummary.xml | 1608 | 2021-05-18 19:50:41 |
| Financial_Report.xlsx | 5601 | 2021-05-18 19:50:41 |
| htld-20210513.htm | 52532 | 2021-05-18 19:50:41 |
| htld-20210513.xsd | 1938 | 2021-05-18 19:50:41 |
| htld-20210513_htm.xml | 9836 | 2021-05-18 19:50:41 |
| htld-20210513_lab.xml | 21922 | 2021-05-18 19:50:41 |
| htld-20210513_pre.xml | 11571 | 2021-05-18 19:50:41 |
| MetaLinks.json | 16177 | 2021-05-18 19:50:41 |
| R1.htm | 34891 | 2021-05-18 19:50:41 |
| report.css | 2766 | 2021-05-18 19:50:41 |
| Show.js | 1084 | 2021-05-18 19:50:41 |