Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-23-000018-index-headers.html | 2023-05-01 18:22:36 | |
| 0000799233-23-000018-index.html | 2023-05-01 18:22:36 | |
| 0000799233-23-000018.txt | 2023-05-01 18:22:36 | |
 0000799233-23-000018-xbrl.zip | 22744 | 2023-05-01 18:22:36 |
| FilingSummary.xml | 1985 | 2023-05-01 18:22:36 |
| Financial_Report.xlsx | 5682 | 2023-05-01 18:22:36 |
| htld-20230427.htm | 44696 | 2023-05-01 18:22:36 |
| htld-20230427.xsd | 1932 | 2023-05-01 18:22:36 |
| htld-20230427_htm.xml | 13797 | 2023-05-01 18:22:36 |
| htld-20230427_lab.xml | 23924 | 2023-05-01 18:22:36 |
| htld-20230427_pre.xml | 12616 | 2023-05-01 18:22:36 |
| htld2023q1earningsrelease.htm | 199968 | 2023-05-01 18:22:36 |
| MetaLinks.json | 17248 | 2023-05-01 18:22:36 |
| R1.htm | 38078 | 2023-05-01 18:22:36 |
| report.css | 2767 | 2023-05-01 18:22:36 |
| Show.js | 1084 | 2023-05-01 18:22:36 |