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| 0000040211-21-000048-index.html | 2021-04-29 14:35:47 | |
| 0000040211-21-000048.txt | 2021-04-29 14:35:47 | |
 0000040211-21-000048-xbrl.zip | 556097 | 2021-04-29 14:35:47 |
| a20210331-exhibit31a.htm | 9789 | 2021-04-29 14:35:47 |
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| a20210331-exhibit32.htm | 7034 | 2021-04-29 14:35:47 |
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| gmt-20210331.xsd | 44573 | 2021-04-29 14:35:47 |
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| gmt-20210331_htm.xml | 1238141 | 2021-04-29 14:35:47 |
| gmt-20210331_lab.xml | 570539 | 2021-04-29 14:35:47 |
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