Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-22-000025-index-headers.html | 2022-05-13 10:21:19 | |
| 0000799233-22-000025-index.html | 2022-05-13 10:21:19 | |
| 0000799233-22-000025.txt | 2022-05-13 10:21:19 | |
 0000799233-22-000025-xbrl.zip | 11406 | 2022-05-13 10:21:19 |
| FilingSummary.xml | 1615 | 2022-05-13 10:21:19 |
| Financial_Report.xlsx | 5657 | 2022-05-13 10:21:19 |
| htld-20220512.htm | 54062 | 2022-05-13 10:21:19 |
| htld-20220512.xsd | 1932 | 2022-05-13 10:21:19 |
| htld-20220512_htm.xml | 11259 | 2022-05-13 10:21:19 |
| htld-20220512_lab.xml | 23924 | 2022-05-13 10:21:19 |
| htld-20220512_pre.xml | 12616 | 2022-05-13 10:21:19 |
| MetaLinks.json | 16714 | 2022-05-13 10:21:19 |
| R1.htm | 38684 | 2022-05-13 10:21:19 |
| report.css | 2766 | 2022-05-13 10:21:19 |
| Show.js | 1084 | 2022-05-13 10:21:19 |