Parent Directory| Name | Size | Last Modified |
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| 0001193125-22-207789-index.html | 2022-08-01 08:01:00 | |
| 0001193125-22-207789.txt | 2022-08-01 08:01:00 | |
 0001193125-22-207789-xbrl.zip | 26347 | 2022-08-01 08:01:00 |
| d383365d8k.htm | 42145 | 2022-08-01 08:01:00 |
| d383365d8k_htm.xml | 3465 | 2022-08-01 08:01:00 |
| d383365dex31.htm | 75017 | 2022-08-01 08:01:00 |
| FilingSummary.xml | 1730 | 2022-08-01 08:01:00 |
| Financial_Report.xlsx | 5714 | 2022-08-01 08:01:00 |
| ghm-20220727.xsd | 2862 | 2022-08-01 08:01:00 |
| ghm-20220727_lab.xml | 17980 | 2022-08-01 08:01:00 |
| ghm-20220727_pre.xml | 11263 | 2022-08-01 08:01:00 |
| MetaLinks.json | 18356 | 2022-08-01 08:01:00 |
| R1.htm | 40083 | 2022-08-01 08:01:00 |
| report.css | 2767 | 2022-08-01 08:01:00 |
| Show.js | 1084 | 2022-08-01 08:01:00 |