Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-21-000037-index-headers.html | 2021-07-19 17:21:33 | |
| 0000799233-21-000037-index.html | 2021-07-19 17:21:33 | |
| 0000799233-21-000037.txt | 2021-07-19 17:21:33 | |
 0000799233-21-000037-xbrl.zip | 22165 | 2021-07-19 17:21:33 |
| FilingSummary.xml | 1649 | 2021-07-19 17:21:33 |
| Financial_Report.xlsx | 5659 | 2021-07-19 17:21:33 |
| htld-20210719.htm | 42088 | 2021-07-19 17:21:33 |
| htld-20210719.xsd | 1926 | 2021-07-19 17:21:33 |
| htld-20210719_htm.xml | 11331 | 2021-07-19 17:21:33 |
| htld-20210719_lab.xml | 23832 | 2021-07-19 17:21:33 |
| htld-20210719_pre.xml | 12524 | 2021-07-19 17:21:33 |
| htld2021q2earningsrelease.htm | 205712 | 2021-07-19 17:21:33 |
| MetaLinks.json | 16829 | 2021-07-19 17:21:33 |
| R1.htm | 38562 | 2021-07-19 17:21:33 |
| report.css | 2767 | 2021-07-19 17:21:33 |
| Show.js | 1084 | 2021-07-19 17:21:33 |