Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000355811-20-000017-index-headers.html | 2020-04-24 08:00:33 | |
| 0000355811-20-000017-index.html | 2020-04-24 08:00:33 | |
| 0000355811-20-000017.txt | 2020-04-24 08:00:33 | |
 0000355811-20-000017-xbrl.zip | 24145 | 2020-04-24 08:00:33 |
| exhibit99103312020.htm | 193202 | 2020-04-24 08:00:33 |
| FilingSummary.xml | 1790 | 2020-04-24 08:00:33 |
| Financial_Report.xlsx | 5804 | 2020-04-24 08:00:33 |
 gentex-black1.jpg | 158578 | 2020-04-24 08:00:33 |
| gntx-20200424.htm | 38345 | 2020-04-24 08:00:33 |
| gntx-20200424.xsd | 2630 | 2020-04-24 08:00:33 |
| gntx-20200424_cal.xml | 775 | 2020-04-24 08:00:33 |
| gntx-20200424_def.xml | 1739 | 2020-04-24 08:00:33 |
| gntx-20200424_htm.xml | 10740 | 2020-04-24 08:00:33 |
| gntx-20200424_lab.xml | 24270 | 2020-04-24 08:00:33 |
| gntx-20200424_pre.xml | 12711 | 2020-04-24 08:00:33 |
| MetaLinks.json | 18442 | 2020-04-24 08:00:33 |
| R1.htm | 38628 | 2020-04-24 08:00:33 |
| report.css | 2767 | 2020-04-24 08:00:33 |
| Show.js | 1085 | 2020-04-24 08:00:33 |