Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-22-000032-index-headers.html | 2022-06-21 10:14:24 | |
| 0000799233-22-000032-index.html | 2022-06-21 10:14:24 | |
| 0000799233-22-000032.txt | 2022-06-21 10:14:24 | |
 0000799233-22-000032-xbrl.zip | 12023 | 2022-06-21 10:14:24 |
| FilingSummary.xml | 1675 | 2022-06-21 10:14:24 |
| Financial_Report.xlsx | 5689 | 2022-06-21 10:14:24 |
| htld-20220617.htm | 38411 | 2022-06-21 10:14:24 |
| htld-20220617.xsd | 2175 | 2022-06-21 10:14:24 |
| htld-20220617_htm.xml | 10816 | 2022-06-21 10:14:24 |
| htld-20220617_lab.xml | 24451 | 2022-06-21 10:14:24 |
| htld-20220617_pre.xml | 12631 | 2022-06-21 10:14:24 |
| htld2022q2dividendreleasee.htm | 4023 | 2022-06-21 10:14:24 |
| MetaLinks.json | 16849 | 2022-06-21 10:14:24 |
| R1.htm | 38574 | 2022-06-21 10:14:24 |
| report.css | 2767 | 2022-06-21 10:14:24 |
| Show.js | 1084 | 2022-06-21 10:14:24 |