Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-22-000027-index-headers.html | 2022-05-25 17:15:28 | |
| 0000799233-22-000027-index.html | 2022-05-25 17:15:28 | |
| 0000799233-22-000027.txt | 2022-05-25 17:15:28 | |
 0000799233-22-000027-xbrl.zip | 10838 | 2022-05-25 17:15:28 |
| FilingSummary.xml | 1615 | 2022-05-25 17:15:28 |
| Financial_Report.xlsx | 5659 | 2022-05-25 17:15:28 |
| htld-20220523.htm | 35311 | 2022-05-25 17:15:28 |
| htld-20220523.xsd | 1932 | 2022-05-25 17:15:28 |
| htld-20220523_htm.xml | 11259 | 2022-05-25 17:15:28 |
| htld-20220523_lab.xml | 23924 | 2022-05-25 17:15:28 |
| htld-20220523_pre.xml | 12616 | 2022-05-25 17:15:28 |
| MetaLinks.json | 16714 | 2022-05-25 17:15:28 |
| R1.htm | 38684 | 2022-05-25 17:15:28 |
| report.css | 2766 | 2022-05-25 17:15:28 |
| Show.js | 1084 | 2022-05-25 17:15:28 |