Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000355811-21-000003-index-headers.html | 2021-01-29 07:59:57 | |
| 0000355811-21-000003-index.html | 2021-01-29 07:59:57 | |
| 0000355811-21-000003.txt | 2021-01-29 07:59:57 | |
 0000355811-21-000003-xbrl.zip | 24096 | 2021-01-29 07:59:57 |
| exhibit99112312020.htm | 156541 | 2021-01-29 07:59:57 |
| FilingSummary.xml | 1790 | 2021-01-29 07:59:57 |
| Financial_Report.xlsx | 5465 | 2021-01-29 07:59:57 |
 gentexa071a.jpg | 714403 | 2021-01-29 07:59:57 |
| gntx-20210129.htm | 32658 | 2021-01-29 07:59:57 |
| gntx-20210129.xsd | 2489 | 2021-01-29 07:59:57 |
| gntx-20210129_cal.xml | 775 | 2021-01-29 07:59:57 |
| gntx-20210129_def.xml | 1731 | 2021-01-29 07:59:57 |
| gntx-20210129_htm.xml | 10759 | 2021-01-29 07:59:57 |
| gntx-20210129_lab.xml | 24270 | 2021-01-29 07:59:57 |
| gntx-20210129_pre.xml | 12711 | 2021-01-29 07:59:57 |
| MetaLinks.json | 17783 | 2021-01-29 07:59:57 |
| R1.htm | 38633 | 2021-01-29 07:59:57 |
| report.css | 2767 | 2021-01-29 07:59:57 |
| Show.js | 1085 | 2021-01-29 07:59:57 |