Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-20-000033-index-headers.html | 2020-07-17 16:44:31 | |
| 0000799233-20-000033-index.html | 2020-07-17 16:44:31 | |
| 0000799233-20-000033.txt | 2020-07-17 16:44:31 | |
 0000799233-20-000033-xbrl.zip | 26750 | 2020-07-17 16:44:31 |
| FilingSummary.xml | 1729 | 2020-07-17 16:44:31 |
| Financial_Report.xlsx | 5446 | 2020-07-17 16:44:31 |
| htld-20200716.htm | 60839 | 2020-07-17 16:44:31 |
| htld-20200716.xsd | 2447 | 2020-07-17 16:44:31 |
| htld-20200716_cal.xml | 726 | 2020-07-17 16:44:31 |
| htld-20200716_def.xml | 1659 | 2020-07-17 16:44:31 |
| htld-20200716_htm.xml | 11171 | 2020-07-17 16:44:31 |
| htld-20200716_lab.xml | 23970 | 2020-07-17 16:44:31 |
| htld-20200716_pre.xml | 12662 | 2020-07-17 16:44:31 |
| htld2020q2earningsrele.htm | 286751 | 2020-07-17 16:44:31 |
| MetaLinks.json | 17405 | 2020-07-17 16:44:31 |
| R1.htm | 38604 | 2020-07-17 16:44:31 |
| report.css | 2767 | 2020-07-17 16:44:31 |
| Show.js | 1085 | 2020-07-17 16:44:31 |