Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-22-000019-index-headers.html | 2022-04-22 17:03:21 | |
| 0000799233-22-000019-index.html | 2022-04-22 17:03:21 | |
| 0000799233-22-000019.txt | 2022-04-22 17:03:21 | |
 0000799233-22-000019-xbrl.zip | 21434 | 2022-04-22 17:03:21 |
| FilingSummary.xml | 1662 | 2022-04-22 17:03:21 |
| Financial_Report.xlsx | 5659 | 2022-04-22 17:03:21 |
| htld-20220421.htm | 42029 | 2022-04-22 17:03:21 |
| htld-20220421.xsd | 1932 | 2022-04-22 17:03:21 |
| htld-20220421_htm.xml | 11257 | 2022-04-22 17:03:21 |
| htld-20220421_lab.xml | 23924 | 2022-04-22 17:03:21 |
| htld-20220421_pre.xml | 12616 | 2022-04-22 17:03:21 |
| htld2022q1earningsrelease.htm | 171924 | 2022-04-22 17:03:21 |
| MetaLinks.json | 16714 | 2022-04-22 17:03:21 |
| R1.htm | 38686 | 2022-04-22 17:03:21 |
| report.css | 2767 | 2022-04-22 17:03:21 |
| Show.js | 1084 | 2022-04-22 17:03:21 |