Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-20-000028-index-headers.html | 2020-05-15 13:32:58 | |
| 0000799233-20-000028-index.html | 2020-05-15 13:32:58 | |
| 0000799233-20-000028.txt | 2020-05-15 13:32:58 | |
 0000799233-20-000028-xbrl.zip | 13594 | 2020-05-15 13:32:58 |
| a2020annualmeetingshar.htm | 66753 | 2020-05-15 13:32:58 |
| a2020annualmeetingshar_htm.xml | 4237 | 2020-05-15 13:32:58 |
| FilingSummary.xml | 1726 | 2020-05-15 13:32:58 |
| Financial_Report.xlsx | 5794 | 2020-05-15 13:32:58 |
| htld-20200514.xsd | 4706 | 2020-05-15 13:32:58 |
| htld-20200514_cal.xml | 636 | 2020-05-15 13:32:58 |
| htld-20200514_def.xml | 1486 | 2020-05-15 13:32:58 |
| htld-20200514_lab.xml | 26457 | 2020-05-15 13:32:58 |
| htld-20200514_pre.xml | 13681 | 2020-05-15 13:32:58 |
| MetaLinks.json | 18552 | 2020-05-15 13:32:58 |
| R1.htm | 38632 | 2020-05-15 13:32:58 |
| report.css | 2767 | 2020-05-15 13:32:58 |
| Show.js | 1085 | 2020-05-15 13:32:58 |