Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-21-000044-index-headers.html | 2021-08-23 16:26:43 | |
| 0000799233-21-000044-index.html | 2021-08-23 16:26:43 | |
| 0000799233-21-000044.txt | 2021-08-23 16:26:43 | |
 0000799233-21-000044-xbrl.zip | 13844 | 2021-08-23 16:26:43 |
| FilingSummary.xml | 1664 | 2021-08-23 16:26:43 |
| Financial_Report.xlsx | 5695 | 2021-08-23 16:26:43 |
| htld-20210820.htm | 44809 | 2021-08-23 16:26:43 |
| htld-20210820.xsd | 2175 | 2021-08-23 16:26:43 |
| htld-20210820_htm.xml | 11081 | 2021-08-23 16:26:43 |
| htld-20210820_lab.xml | 24451 | 2021-08-23 16:26:43 |
| htld-20210820_pre.xml | 12631 | 2021-08-23 16:26:43 |
| MetaLinks.json | 17014 | 2021-08-23 16:26:43 |
| q32021regularandspecialdiv.htm | 7915 | 2021-08-23 16:26:43 |
| R1.htm | 39631 | 2021-08-23 16:26:43 |
| report.css | 2767 | 2021-08-23 16:26:43 |
| Show.js | 1084 | 2021-08-23 16:26:43 |