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| 0000891014-19-000010-index.html | 2019-02-15 13:58:31 | |
| 0000891014-19-000010.txt | 2019-02-15 13:58:31 | |
 0000891014-19-000010-xbrl.zip | 337982 | 2019-02-15 13:58:31 |
| ex21_1.htm | 95590 | 2019-02-15 13:58:31 |
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| FilingSummary.xml | 51753 | 2019-02-15 13:58:31 |
| Financial_Report.xlsx | 139212 | 2019-02-15 13:58:31 |
| form10k.htm | 3581404 | 2019-02-15 13:58:31 |
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| mtx-20181231.xml | 4091027 | 2019-02-15 13:58:31 |
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| report.css | 2768 | 2019-02-15 13:58:31 |
| Show.js | 1086 | 2019-02-15 13:58:31 |