Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000355811-21-000031-index-headers.html | 2021-08-04 14:01:52 | |
| 0000355811-21-000031-index.html | 2021-08-04 14:01:52 | |
| 0000355811-21-000031.txt | 2021-08-04 14:01:52 | |
 0000355811-21-000031-xbrl.zip | 13966 | 2021-08-04 14:01:52 |
| exhibit99108042021.htm | 11383 | 2021-08-04 14:01:52 |
| FilingSummary.xml | 1707 | 2021-08-04 14:01:52 |
| Financial_Report.xlsx | 5687 | 2021-08-04 14:01:52 |
 gentex-black.jpg | 158578 | 2021-08-04 14:01:52 |
| gntx-20210804.htm | 32321 | 2021-08-04 14:01:52 |
| gntx-20210804.xsd | 1968 | 2021-08-04 14:01:52 |
| gntx-20210804_htm.xml | 10753 | 2021-08-04 14:01:52 |
| gntx-20210804_lab.xml | 24132 | 2021-08-04 14:01:52 |
| gntx-20210804_pre.xml | 12573 | 2021-08-04 14:01:52 |
| MetaLinks.json | 17207 | 2021-08-04 14:01:52 |
| R1.htm | 38594 | 2021-08-04 14:01:52 |
| report.css | 2767 | 2021-08-04 14:01:52 |
| Show.js | 1085 | 2021-08-04 14:01:52 |