Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-23-000013-index-headers.html | 2023-03-31 15:39:00 | |
| 0000799233-23-000013-index.html | 2023-03-31 15:39:00 | |
| 0000799233-23-000013.txt | 2023-03-31 15:39:00 | |
 0000799233-23-000013-xbrl.zip | 2641997 | 2023-03-31 15:39:00 |
| FilingSummary.xml | 2756 | 2023-03-31 15:39:00 |
| htld-20230331.htm | 511830 | 2023-03-31 15:39:00 |
| htld-20230331.xsd | 11815 | 2023-03-31 15:39:00 |
| htld-20230331_def.xml | 26938 | 2023-03-31 15:39:00 |
 htld-20230331_g1.jpg | 550898 | 2023-03-31 15:39:00 |
 htld-20230331_g2.jpg | 545412 | 2023-03-31 15:39:00 |
 htld-20230331_g3.jpg | 550994 | 2023-03-31 15:39:00 |
 htld-20230331_g4.jpg | 645547 | 2023-03-31 15:39:00 |
 htld-20230331_g5.jpg | 1156947 | 2023-03-31 15:39:00 |
| htld-20230331_htm.xml | 80177 | 2023-03-31 15:39:00 |
| htld-20230331_lab.xml | 67209 | 2023-03-31 15:39:00 |
| htld-20230331_pre.xml | 28530 | 2023-03-31 15:39:00 |
| MetaLinks.json | 34202 | 2023-03-31 15:39:00 |
| R1.htm | 10846 | 2023-03-31 15:39:00 |
| R2.htm | 107556 | 2023-03-31 15:39:00 |
| report.css | 2767 | 2023-03-31 15:39:00 |
| Show.js | 1085 | 2023-03-31 15:39:00 |