Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-22-000011-index-headers.html | 2022-03-16 08:49:11 | |
| 0000799233-22-000011-index.html | 2022-03-16 08:49:11 | |
| 0000799233-22-000011.txt | 2022-03-16 08:49:11 | |
 0000799233-22-000011-xbrl.zip | 12018 | 2022-03-16 08:49:11 |
| FilingSummary.xml | 1678 | 2022-03-16 08:49:11 |
| Financial_Report.xlsx | 5668 | 2022-03-16 08:49:11 |
| htld-20220315.htm | 38415 | 2022-03-16 08:49:11 |
| htld-20220315.xsd | 2175 | 2022-03-16 08:49:11 |
| htld-20220315_htm.xml | 10816 | 2022-03-16 08:49:11 |
| htld-20220315_lab.xml | 24451 | 2022-03-16 08:49:11 |
| htld-20220315_pre.xml | 12631 | 2022-03-16 08:49:11 |
| htld2022q1dividendreleasee.htm | 4035 | 2022-03-16 08:49:11 |
| MetaLinks.json | 16850 | 2022-03-16 08:49:11 |
| R1.htm | 38599 | 2022-03-16 08:49:11 |
| report.css | 2767 | 2022-03-16 08:49:11 |
| Show.js | 1084 | 2022-03-16 08:49:11 |