Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000355811-21-000015-index-headers.html | 2021-04-23 08:01:22 | |
| 0000355811-21-000015-index.html | 2021-04-23 08:01:22 | |
| 0000355811-21-000015.txt | 2021-04-23 08:01:22 | |
 0000355811-21-000015-xbrl.zip | 23257 | 2021-04-23 08:01:22 |
| exhibit99103312021.htm | 136925 | 2021-04-23 08:01:22 |
| FilingSummary.xml | 1790 | 2021-04-23 08:01:22 |
| Financial_Report.xlsx | 5683 | 2021-04-23 08:01:22 |
 gentex-black1a.jpg | 158578 | 2021-04-23 08:01:22 |
| gntx-20210423.htm | 32635 | 2021-04-23 08:01:22 |
| gntx-20210423.xsd | 2489 | 2021-04-23 08:01:22 |
| gntx-20210423_cal.xml | 775 | 2021-04-23 08:01:22 |
| gntx-20210423_def.xml | 1731 | 2021-04-23 08:01:22 |
| gntx-20210423_htm.xml | 10759 | 2021-04-23 08:01:22 |
| gntx-20210423_lab.xml | 24270 | 2021-04-23 08:01:22 |
| gntx-20210423_pre.xml | 12711 | 2021-04-23 08:01:22 |
| MetaLinks.json | 17783 | 2021-04-23 08:01:22 |
| R1.htm | 38633 | 2021-04-23 08:01:22 |
| report.css | 2767 | 2021-04-23 08:01:22 |
| Show.js | 1085 | 2021-04-23 08:01:22 |