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| 0000355811-18-000009-index.html | 2018-02-21 14:23:29 | |
| 0000355811-18-000009.txt | 2018-02-21 14:23:29 | |
 0000355811-18-000009-xbrl.zip | 257326 | 2018-02-21 14:23:29 |
 chart-a92b28ce28055fe49a0.jpg | 87250 | 2018-02-21 14:23:29 |
| FilingSummary.xml | 38343 | 2018-02-21 14:23:29 |
| Financial_Report.xlsx | 91694 | 2018-02-21 14:23:29 |
| gntx-20171231.xml | 2695339 | 2018-02-21 14:23:29 |
| gntx-20171231.xsd | 47384 | 2018-02-21 14:23:29 |
| gntx-20171231_cal.xml | 105001 | 2018-02-21 14:23:29 |
| gntx-20171231_def.xml | 255834 | 2018-02-21 14:23:29 |
| gntx-20171231_lab.xml | 766211 | 2018-02-21 14:23:29 |
| gntx-20171231_pre.xml | 443345 | 2018-02-21 14:23:29 |
| gntx12312017-10k.htm | 1937636 | 2018-02-21 14:23:29 |
| gntx12312017-ex1019.htm | 19612 | 2018-02-21 14:23:29 |
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| report.css | 2767 | 2018-02-21 14:23:29 |
| Show.js | 1410 | 2018-02-21 14:23:29 |