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| 0000912562-23-000009-index.html | 2023-02-22 16:04:33 | |
| 0000912562-23-000009.txt | 2023-02-22 16:04:33 | |
 0000912562-23-000009-xbrl.zip | 597763 | 2023-02-22 16:04:33 |
| ex41descriptionofregistran.htm | 27965 | 2023-02-22 16:04:33 |
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| Financial_Report.xlsx | 171567 | 2023-02-22 16:04:33 |
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| report.css | 2768 | 2023-02-22 16:04:33 |
| rock-20221231.htm | 2891765 | 2023-02-22 16:04:33 |
| rock-20221231.xsd | 82945 | 2023-02-22 16:04:33 |
| rock-20221231_cal.xml | 133557 | 2023-02-22 16:04:33 |
| rock-20221231_def.xml | 470552 | 2023-02-22 16:04:33 |
 rock-20221231_g1.jpg | 147573 | 2023-02-22 16:04:33 |
 rock-20221231_g2.jpg | 1398 | 2023-02-22 16:04:33 |
| rock-20221231_htm.xml | 2841618 | 2023-02-22 16:04:33 |
| rock-20221231_lab.xml | 1000095 | 2023-02-22 16:04:33 |
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| Show.js | 1086 | 2023-02-22 16:04:33 |