Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000045919-25-000008-index-headers.html | 2025-03-17 17:03:27 | |
| 0000045919-25-000008-index.html | 2025-03-17 17:03:27 | |
| 0000045919-25-000008.txt | 2025-03-17 17:03:27 | |
 0000045919-25-000008-xbrl.zip | 337569 | 2025-03-17 17:03:27 |
| a20241231ex19insidertrading.htm | 15751 | 2025-03-17 17:03:27 |
| a20241231ex211sublist.htm | 19583 | 2025-03-17 17:03:27 |
| a20241231ex231btconsent.htm | 2498 | 2025-03-17 17:03:27 |
| a20241231ex232wolfcoconsent.htm | 2436 | 2025-03-17 17:03:27 |
| a20241231ex311.htm | 10424 | 2025-03-17 17:03:27 |
| a20241231ex312.htm | 10554 | 2025-03-17 17:03:27 |
| a20241231ex321.htm | 4841 | 2025-03-17 17:03:27 |
| a20241231ex322.htm | 5213 | 2025-03-17 17:03:27 |
| FilingSummary.xml | 48727 | 2025-03-17 17:03:27 |
| Financial_Report.xlsx | 134993 | 2025-03-17 17:03:27 |
| hrth-20241231.htm | 1641483 | 2025-03-17 17:03:27 |
| hrth-20241231.xsd | 60078 | 2025-03-17 17:03:27 |
| hrth-20241231_cal.xml | 126456 | 2025-03-17 17:03:27 |
| hrth-20241231_def.xml | 293177 | 2025-03-17 17:03:27 |
| hrth-20241231_htm.xml | 1758502 | 2025-03-17 17:03:27 |
| hrth-20241231_lab.xml | 888912 | 2025-03-17 17:03:27 |
| hrth-20241231_pre.xml | 633723 | 2025-03-17 17:03:27 |
| MetaLinks.json | 1154220 | 2025-03-17 17:03:27 |
| R1.htm | 64822 | 2025-03-17 17:03:27 |
| R10.htm | 35979 | 2025-03-17 17:03:27 |
| R11.htm | 130731 | 2025-03-17 17:03:27 |
| R12.htm | 5545 | 2025-03-17 17:03:27 |
| R13.htm | 6892 | 2025-03-17 17:03:27 |
| R14.htm | 77913 | 2025-03-17 17:03:27 |
| R15.htm | 150896 | 2025-03-17 17:03:27 |
| R16.htm | 80907 | 2025-03-17 17:03:27 |
| R17.htm | 15841 | 2025-03-17 17:03:27 |
| R18.htm | 26245 | 2025-03-17 17:03:27 |
| R19.htm | 8222 | 2025-03-17 17:03:27 |
| R2.htm | 7794 | 2025-03-17 17:03:27 |
| R20.htm | 32610 | 2025-03-17 17:03:27 |
| R21.htm | 93202 | 2025-03-17 17:03:27 |
| R22.htm | 14484 | 2025-03-17 17:03:27 |
| R23.htm | 8465 | 2025-03-17 17:03:27 |
| R24.htm | 4371 | 2025-03-17 17:03:27 |
| R25.htm | 46849 | 2025-03-17 17:03:27 |
| R26.htm | 128950 | 2025-03-17 17:03:27 |
| R27.htm | 70369 | 2025-03-17 17:03:27 |
| R28.htm | 19779 | 2025-03-17 17:03:27 |
| R29.htm | 66649 | 2025-03-17 17:03:27 |
| R3.htm | 120722 | 2025-03-17 17:03:27 |
| R30.htm | 72011 | 2025-03-17 17:03:27 |
| R31.htm | 154820 | 2025-03-17 17:03:27 |
| R32.htm | 79654 | 2025-03-17 17:03:27 |
| R33.htm | 13999 | 2025-03-17 17:03:27 |
| R34.htm | 25224 | 2025-03-17 17:03:27 |
| R35.htm | 33428 | 2025-03-17 17:03:27 |
| R36.htm | 80886 | 2025-03-17 17:03:27 |
| R37.htm | 54271 | 2025-03-17 17:03:27 |
| R38.htm | 10474 | 2025-03-17 17:03:27 |
| R39.htm | 16175 | 2025-03-17 17:03:27 |
| R4.htm | 16378 | 2025-03-17 17:03:27 |
| R40.htm | 11203 | 2025-03-17 17:03:27 |
| R41.htm | 31930 | 2025-03-17 17:03:27 |
| R42.htm | 15217 | 2025-03-17 17:03:27 |
| R43.htm | 10235 | 2025-03-17 17:03:27 |
| R44.htm | 21252 | 2025-03-17 17:03:27 |
| R45.htm | 14849 | 2025-03-17 17:03:27 |
| R46.htm | 9957 | 2025-03-17 17:03:27 |
| R47.htm | 18973 | 2025-03-17 17:03:27 |
| R48.htm | 39198 | 2025-03-17 17:03:27 |
| R49.htm | 37442 | 2025-03-17 17:03:27 |
| R5.htm | 99665 | 2025-03-17 17:03:27 |
| R50.htm | 40396 | 2025-03-17 17:03:27 |
| R51.htm | 9275 | 2025-03-17 17:03:27 |
| R52.htm | 32166 | 2025-03-17 17:03:27 |
| R53.htm | 80337 | 2025-03-17 17:03:27 |
| R54.htm | 60232 | 2025-03-17 17:03:27 |
| R55.htm | 30962 | 2025-03-17 17:03:27 |
| R56.htm | 25160 | 2025-03-17 17:03:27 |
| R57.htm | 25106 | 2025-03-17 17:03:27 |
| R58.htm | 41193 | 2025-03-17 17:03:27 |
| R59.htm | 34040 | 2025-03-17 17:03:27 |
| R6.htm | 36027 | 2025-03-17 17:03:27 |
| R60.htm | 15614 | 2025-03-17 17:03:27 |
| R61.htm | 5759 | 2025-03-17 17:03:27 |
| R62.htm | 10086 | 2025-03-17 17:03:27 |
| R63.htm | 21862 | 2025-03-17 17:03:27 |
| R64.htm | 17187 | 2025-03-17 17:03:27 |
| R65.htm | 36037 | 2025-03-17 17:03:27 |
| R66.htm | 41119 | 2025-03-17 17:03:27 |
| R67.htm | 15609 | 2025-03-17 17:03:27 |
| R68.htm | 28516 | 2025-03-17 17:03:27 |
| R69.htm | 12388 | 2025-03-17 17:03:27 |
| R7.htm | 88997 | 2025-03-17 17:03:27 |
| R70.htm | 34443 | 2025-03-17 17:03:27 |
| R71.htm | 42609 | 2025-03-17 17:03:27 |
| R72.htm | 18400 | 2025-03-17 17:03:27 |
| R73.htm | 34936 | 2025-03-17 17:03:27 |
| R74.htm | 9675 | 2025-03-17 17:03:27 |
| R75.htm | 26441 | 2025-03-17 17:03:27 |
| R76.htm | 4543 | 2025-03-17 17:03:27 |
| R77.htm | 16108 | 2025-03-17 17:03:27 |
| R78.htm | 19738 | 2025-03-17 17:03:27 |
| R79.htm | 17581 | 2025-03-17 17:03:27 |
| R8.htm | 8025 | 2025-03-17 17:03:27 |
| R80.htm | 5016 | 2025-03-17 17:03:27 |
| R81.htm | 57243 | 2025-03-17 17:03:27 |
| R9.htm | 93061 | 2025-03-17 17:03:27 |
| report.css | 2767 | 2025-03-17 17:03:27 |
| Show.js | 1085 | 2025-03-17 17:03:27 |