Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-21-000060-index-headers.html | 2021-11-24 11:47:42 | |
| 0000799233-21-000060-index.html | 2021-11-24 11:47:42 | |
| 0000799233-21-000060.txt | 2021-11-24 11:47:42 | |
 0000799233-21-000060-xbrl.zip | 12078 | 2021-11-24 11:47:42 |
| FilingSummary.xml | 1664 | 2021-11-24 11:47:42 |
| Financial_Report.xlsx | 5695 | 2021-11-24 11:47:42 |
| htld-20211122.htm | 38739 | 2021-11-24 11:47:42 |
| htld-20211122.xsd | 2175 | 2021-11-24 11:47:42 |
| htld-20211122_htm.xml | 11141 | 2021-11-24 11:47:42 |
| htld-20211122_lab.xml | 24451 | 2021-11-24 11:47:42 |
| htld-20211122_pre.xml | 12631 | 2021-11-24 11:47:42 |
| htld2021q4dividendreleasee.htm | 3991 | 2021-11-24 11:47:42 |
| MetaLinks.json | 16849 | 2021-11-24 11:47:42 |
| R1.htm | 39631 | 2021-11-24 11:47:42 |
| report.css | 2767 | 2021-11-24 11:47:42 |
| Show.js | 1084 | 2021-11-24 11:47:42 |