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| 0000912562-20-000009-index.html | 2020-03-03 16:23:51 | |
| 0000912562-20-000009.txt | 2020-03-03 16:23:51 | |
 0000912562-20-000009-xbrl.zip | 62607 | 2020-03-03 16:23:51 |
| a8-kq42019earningsrele.htm | 63346 | 2020-03-03 16:23:51 |
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| exhibit991q42019earnin.htm | 663001 | 2020-03-03 16:23:51 |
| exhibit992appointmento.htm | 12328 | 2020-03-03 16:23:51 |
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| Financial_Report.xlsx | 5845 | 2020-03-03 16:23:51 |
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| MetaLinks.json | 19255 | 2020-03-03 16:23:51 |
| R1.htm | 40215 | 2020-03-03 16:23:51 |
| report.css | 2767 | 2020-03-03 16:23:51 |
| rock-20200303.xsd | 4857 | 2020-03-03 16:23:51 |
| rock-20200303_cal.xml | 651 | 2020-03-03 16:23:51 |
| rock-20200303_def.xml | 1501 | 2020-03-03 16:23:51 |
| rock-20200303_lab.xml | 27588 | 2020-03-03 16:23:51 |
| rock-20200303_pre.xml | 14260 | 2020-03-03 16:23:51 |
| Show.js | 1085 | 2020-03-03 16:23:51 |