Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-21-000026-index-headers.html | 2021-04-21 17:24:44 | |
| 0000799233-21-000026-index.html | 2021-04-21 17:24:44 | |
| 0000799233-21-000026.txt | 2021-04-21 17:24:44 | |
 0000799233-21-000026-xbrl.zip | 22004 | 2021-04-21 17:24:44 |
| FilingSummary.xml | 1732 | 2021-04-21 17:24:44 |
| Financial_Report.xlsx | 5693 | 2021-04-21 17:24:44 |
| htld-20210421.htm | 42267 | 2021-04-21 17:24:44 |
| htld-20210421.xsd | 2447 | 2021-04-21 17:24:44 |
| htld-20210421_cal.xml | 726 | 2021-04-21 17:24:44 |
| htld-20210421_def.xml | 1659 | 2021-04-21 17:24:44 |
| htld-20210421_htm.xml | 11515 | 2021-04-21 17:24:44 |
| htld-20210421_lab.xml | 23970 | 2021-04-21 17:24:44 |
| htld-20210421_pre.xml | 12662 | 2021-04-21 17:24:44 |
| htld2021q1earningsrelease.htm | 162549 | 2021-04-21 17:24:44 |
| MetaLinks.json | 17405 | 2021-04-21 17:24:44 |
| R1.htm | 39638 | 2021-04-21 17:24:44 |
| report.css | 2767 | 2021-04-21 17:24:44 |
| Show.js | 1085 | 2021-04-21 17:24:44 |