Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-21-000058-index-headers.html | 2021-11-15 18:02:44 | |
| 0000799233-21-000058-index.html | 2021-11-15 18:02:44 | |
| 0000799233-21-000058.txt | 2021-11-15 18:02:44 | |
 0000799233-21-000058-xbrl.zip | 10594 | 2021-11-15 18:02:44 |
| FilingSummary.xml | 1602 | 2021-11-15 18:02:44 |
| Financial_Report.xlsx | 5681 | 2021-11-15 18:02:44 |
| htld-20211111.htm | 35141 | 2021-11-15 18:02:44 |
| htld-20211111.xsd | 1926 | 2021-11-15 18:02:44 |
| htld-20211111_htm.xml | 11580 | 2021-11-15 18:02:44 |
| htld-20211111_lab.xml | 23832 | 2021-11-15 18:02:44 |
| htld-20211111_pre.xml | 12524 | 2021-11-15 18:02:44 |
| MetaLinks.json | 16664 | 2021-11-15 18:02:44 |
| R1.htm | 39596 | 2021-11-15 18:02:44 |
| report.css | 2766 | 2021-11-15 18:02:44 |
| Show.js | 1084 | 2021-11-15 18:02:44 |