Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-21-000002-index-headers.html | 2021-01-20 09:08:40 | |
| 0000799233-21-000002-index.html | 2021-01-20 09:08:40 | |
| 0000799233-21-000002.txt | 2021-01-20 09:08:40 | |
 0000799233-21-000002-xbrl.zip | 24589 | 2021-01-20 09:08:40 |
| a2020q4earningsrelease.htm | 172276 | 2021-01-20 09:08:40 |
| FilingSummary.xml | 1729 | 2021-01-20 09:08:40 |
| Financial_Report.xlsx | 5473 | 2021-01-20 09:08:40 |
| htld-20210119.htm | 42502 | 2021-01-20 09:08:40 |
| htld-20210119.xsd | 2447 | 2021-01-20 09:08:40 |
| htld-20210119_cal.xml | 726 | 2021-01-20 09:08:40 |
| htld-20210119_def.xml | 1659 | 2021-01-20 09:08:40 |
| htld-20210119_htm.xml | 11515 | 2021-01-20 09:08:40 |
| htld-20210119_lab.xml | 23970 | 2021-01-20 09:08:40 |
| htld-20210119_pre.xml | 12662 | 2021-01-20 09:08:40 |
| MetaLinks.json | 17405 | 2021-01-20 09:08:40 |
| R1.htm | 39638 | 2021-01-20 09:08:40 |
| report.css | 2767 | 2021-01-20 09:08:40 |
| Show.js | 1085 | 2021-01-20 09:08:40 |