Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-22-000008-index-headers.html | 2022-03-11 17:19:44 | |
| 0000799233-22-000008-index.html | 2022-03-11 17:19:44 | |
| 0000799233-22-000008.txt | 2022-03-11 17:19:44 | |
 0000799233-22-000008-xbrl.zip | 10517 | 2022-03-11 17:19:44 |
| FilingSummary.xml | 1618 | 2022-03-11 17:19:44 |
| Financial_Report.xlsx | 5661 | 2022-03-11 17:19:44 |
| htld-20220307.htm | 32866 | 2022-03-11 17:19:44 |
| htld-20220307.xsd | 1932 | 2022-03-11 17:19:44 |
| htld-20220307_htm.xml | 11440 | 2022-03-11 17:19:44 |
| htld-20220307_lab.xml | 23924 | 2022-03-11 17:19:44 |
| htld-20220307_pre.xml | 12616 | 2022-03-11 17:19:44 |
| MetaLinks.json | 16715 | 2022-03-11 17:19:44 |
| R1.htm | 38557 | 2022-03-11 17:19:44 |
| report.css | 2766 | 2022-03-11 17:19:44 |
| Show.js | 1084 | 2022-03-11 17:19:44 |