Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000799233-20-000021-index-headers.html | 2020-04-22 13:12:02 | |
| 0000799233-20-000021-index.html | 2020-04-22 13:12:02 | |
| 0000799233-20-000021.txt | 2020-04-22 13:12:02 | |
 0000799233-20-000021-xbrl.zip | 23059 | 2020-04-22 13:12:02 |
| FilingSummary.xml | 1729 | 2020-04-22 13:12:02 |
| Financial_Report.xlsx | 5793 | 2020-04-22 13:12:02 |
| htld-20200421.htm | 52778 | 2020-04-22 13:12:02 |
| htld-20200421.xsd | 2588 | 2020-04-22 13:12:02 |
| htld-20200421_cal.xml | 726 | 2020-04-22 13:12:02 |
| htld-20200421_def.xml | 1690 | 2020-04-22 13:12:02 |
| htld-20200421_htm.xml | 11171 | 2020-04-22 13:12:02 |
| htld-20200421_lab.xml | 23970 | 2020-04-22 13:12:02 |
| htld-20200421_pre.xml | 12662 | 2020-04-22 13:12:02 |
| htld2020q1earningsrele.htm | 211246 | 2020-04-22 13:12:02 |
| MetaLinks.json | 18064 | 2020-04-22 13:12:02 |
| R1.htm | 38600 | 2020-04-22 13:12:02 |
| report.css | 2767 | 2020-04-22 13:12:02 |
| Show.js | 1084 | 2020-04-22 13:12:02 |