Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-23-000016-index-headers.html | 2023-04-14 18:15:33 | |
| 0000799233-23-000016-index.html | 2023-04-14 18:15:33 | |
| 0000799233-23-000016.txt | 2023-04-14 18:15:33 | |
 0000799233-23-000016-xbrl.zip | 9248 | 2023-04-14 18:15:33 |
| FilingSummary.xml | 1627 | 2023-04-14 18:15:33 |
| Financial_Report.xlsx | 5690 | 2023-04-14 18:15:33 |
| htld-20230411.htm | 29502 | 2023-04-14 18:15:33 |
| htld-20230411.xsd | 2175 | 2023-04-14 18:15:33 |
| htld-20230411_htm.xml | 4100 | 2023-04-14 18:15:33 |
| htld-20230411_lab.xml | 24451 | 2023-04-14 18:15:33 |
| htld-20230411_pre.xml | 12631 | 2023-04-14 18:15:33 |
| MetaLinks.json | 17381 | 2023-04-14 18:15:33 |
| R1.htm | 38122 | 2023-04-14 18:15:33 |
| report.css | 2766 | 2023-04-14 18:15:33 |
| Show.js | 1084 | 2023-04-14 18:15:33 |