Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-22-000003-index-headers.html | 2022-01-21 10:58:35 | |
| 0000799233-22-000003-index.html | 2022-01-21 10:58:35 | |
| 0000799233-22-000003.txt | 2022-01-21 10:58:35 | |
 0000799233-22-000003-xbrl.zip | 22409 | 2022-01-21 10:58:35 |
| a2021q4earningsrelease.htm | 158939 | 2022-01-21 10:58:35 |
| FilingSummary.xml | 1649 | 2022-01-21 10:58:35 |
| Financial_Report.xlsx | 5659 | 2022-01-21 10:58:35 |
| htld-20220120.htm | 42069 | 2022-01-21 10:58:35 |
| htld-20220120.xsd | 1932 | 2022-01-21 10:58:35 |
| htld-20220120_htm.xml | 11257 | 2022-01-21 10:58:35 |
| htld-20220120_lab.xml | 23924 | 2022-01-21 10:58:35 |
| htld-20220120_pre.xml | 12616 | 2022-01-21 10:58:35 |
| MetaLinks.json | 16715 | 2022-01-21 10:58:35 |
| R1.htm | 38554 | 2022-01-21 10:58:35 |
| report.css | 2767 | 2022-01-21 10:58:35 |
| Show.js | 1084 | 2022-01-21 10:58:35 |