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| 0001704715-20-000059-index.html | 2020-12-18 16:22:20 | |
| 0001704715-20-000059.txt | 2020-12-18 16:22:20 | |
 0001704715-20-000059-xbrl.zip | 16483 | 2020-12-18 16:22:20 |
| a12182020exhibit991.htm | 12543 | 2020-12-18 16:22:20 |
| ctra-20201214.htm | 41005 | 2020-12-18 16:22:20 |
| ctra-20201214.xsd | 2438 | 2020-12-18 16:22:20 |
| ctra-20201214_cal.xml | 720 | 2020-12-18 16:22:20 |
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| Financial_Report.xlsx | 5426 | 2020-12-18 16:22:20 |
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 releasefootera221a.jpg | 164136 | 2020-12-18 16:22:20 |
| report.css | 2767 | 2020-12-18 16:22:20 |
| Show.js | 1085 | 2020-12-18 16:22:20 |